Reader orientation

The term upper-chain parties is used to describe the buyers, contracting authorities, clients, principal contractors, main contractors, framework operators, procurement platforms and other parties that define the requirements temporary labour must satisfy. These parties are central to the research because they increasingly carry the procurement, tax, social value, fair-work, modern slavery, reporting, audit and public-accountability expectations affected by lower-chain labour activity.

The central thesis is that:

Modern temporary labour governance is moving from downstream supplier mandates to upstream supply-line transaction evidence.

That thesis frames the paper’s main working output: the Reference-to-Question Evidence Map.

The map translates official legislation, guidance, policy and enforcement direction into practical question sets that upper-chain parties increasingly need temporary labour chains to answer. It identifies the reference position, the requirement owner, the lead evidence question, the practical question set and the supply-line evidence implication created by each reference.

The paper separates reference position from interpretation, uses multi-question sets, and flags where a reference is policy, guidance, consultation material or legislation. It translates the convergence of different reference regimes into the operating requirement that now matters to upper-chain parties: clearer evidence of temporary labour engagements, payroll routes, worker treatment, payment routes, tax treatment, project attribution and accountable parties.

SLTE-002 is a standalone research output within a wider Augscape temporary labour research sequence. It builds from earlier research into market structure, engagement-route risk and ethical outcomes, then sets out the practical data implications for temporary labour governance without relying on any particular platform, supplier or operating model.

Assertive narrative language is used where the research position has been derived from earlier papers in the Augscape temporary labour sequence, the reference-to-question mapping process and confidential industry stakeholder insight. Those inputs provide the basis for the paper’s framing of market direction, evidence gaps and practical implications.

Section 1

Executive Summary

Temporary labour is a major operating environment in the UK economy. The Recruitment and Employment Confederation reported that the UK recruitment industry contributed £40.6 billion in GVA in 2024, with temporary and contract placements accounting for 76.7% of sector GVA and around 872,000 temporary or contract workers on assignment on any given day in 2024.¹ A market of that scale would normally be expected to operate from reliable transaction-level evidence.

The central problem explored in this paper is that temporary labour often operates through fragmented evidence. The market may contain many records while still lacking a reliable account of the underlying transactions driving results and outcomes. Supplier records, agency records, payroll records, payslips, timesheets, invoices, declarations and audit responses may all exist, but still fail to show clearly how one labour requirement became one worker-linked engagement, one payment route, one tax treatment, one project attribution and one accountable outcome.

The references assessed in this paper point toward one realistic requirement: clearer evidence of how temporary labour is requested, supplied, engaged, treated, paid, taxed, attributed, reported and assured.

The paper frames that requirement through the concept of the supply line. A supply chain is the wider commercial structure. A supply line is the specific route through which a labour requirement becomes an actual transaction. It is the route where the worker is supplied, the engagement is formed, the payer is identified, the tax or payment treatment is applied, the worker-facing outcome is created and the evidence record is generated.

The Reference-to-Question Evidence Map translates official references into practical evidence questions. It does not treat each reference as a complete data specification. Instead, it identifies the questions temporary labour chains increasingly need to answer if upper-chain parties are to understand and evidence the outcomes created beneath them.

Across those references, the same evidence themes recur. The relevant questions repeatedly return to worker attribution, supplier route, engagement party, payer, payroll route, tax treatment, hours, pay, deductions, worker-facing information, project attribution, accountability and evidence state. The convergence is important: different legal, policy and procurement references are increasingly dependent on the same underlying supply-line facts.

Existing governance methods do not reliably create that evidence position. Supplier approval, contractual flow-down, declarations, audit rights and retrospective evidence requests remain useful, but they usually operate at supplier or contract level. They do not, by themselves, provide continuous visibility of active supply lines, worker-linked transaction evidence, project-attributed records or timely control over the route through which exposure is created.

For upper-chain and adjacent parties, the evidence gap affects the quality of reliance. Public buyers, contractors, procurement platforms, funders and insurers may depend on temporary labour outcomes without being able to connect those outcomes to the actual route, payer, worker-facing record, tax treatment, project, exception state or accountable party. That weakens procurement assurance, tax assurance, social value reporting, modern slavery controls, fair-work evidence, funding confidence, insurance defensibility and public accountability.

On that basis, the paper identifies the minimum evidence position a credible temporary labour supply line would need to support: worker-linked, route-specific, project-attributed, payment-aware, tax-aware, time-stamped, reconcilable, exception-capable and capable of controlled upstream reporting.

That evidence position shifts the focus away from supplier declarations and retrospective audit packs, and toward supply-line transaction evidence created closer to the point where exposure arises. The requirement is no longer only to approve suppliers or audit records after the event, but to understand, control and evidence the supply lines through which temporary labour activity becomes economically, legally and ethically real.

The overall finding is that temporary labour governance now depends on evidence created at the level where the outcome is created. The upper chain owns the requirement. The lower chain creates the transaction. The supply line is the evidence route between the two.

Section 2

Purpose, Scope and Interpretation Boundaries

2.1 Purpose of this paper

This document is the final paper in a connected Augscape temporary labour research sequence. The earlier papers examined temporary labour through market structure, engagement-route exposure and worker-facing ethical outcomes. This paper brings those findings together and asks what transactional evidence is now required for labour chains to operate sustainably under increasing regulatory, procurement and policy pressure.

AMTF-001 assessed multi-party markets through the lens of transaction architecture and operating truth. It identified fragmentation, retrospective assessment and distributed accountability as structural weaknesses in markets that lack timely visibility and control over the activity creating economic outcomes. Temporary labour was identified as a significant market affected by those weaknesses, with fragmented records contributing to suboptimal financial and ethical outcomes.

CLCRH-001 mapped temporary labour engagement routes and identified route exposure as a consequence of that structural weakness. Where labour chains cannot clearly see, control or evidence the engagement route being used, different employment-status treatments, payment models and contractual arrangements can create materially different risk outcomes. The paper framed route adherence as vital to sustainable labour-chain performance.

ULESV-001 assessed umbrella payroll through ethics, social value and ESG lenses. It identified the worker-facing consequences of opaque or fragmented engagement routes, including pressure on fair work, fair pay, worker dignity, worker understanding, pay transparency, grievance access, ethical procurement, social value and public defensibility. It framed the reduction, displacement or control of umbrella-like opaque routes as necessary for more sustainable outcomes.

Taken together, those papers identify temporary labour as a significant and sizeable market that remains structurally flawed. Its core activity is frequently fragmented across separate engagement routes, payment routes, contractual relationships, worker-treatment decisions and evidence records. That fragmentation creates systemic problems for all parties involved: weak visibility, distributed accountability, inconsistent outcomes, delayed evidence, financial leakage, ethical risk and limited upstream assurance.

This paper completes that research progression. It considers why temporary labour can no longer sustain those conditions in light of the regulatory, procurement and policy patterns identified through this paper’s reference-to-question mapping process. It then pinpoints the evidence needed for labour chains to support route adherence, worker treatment, payment integrity, tax treatment, project attribution and ethical outcomes against those emerging expectations.

Its purpose is to answer one practical question:

What evidence does a temporary labour chain need in order to demonstrate that temporary labour activity was transparent, properly attributed, fairly treated, properly paid, properly taxed, commercially viable and capable of upstream assurance?

2.2 Scope

This document focuses on UK temporary labour supply chains and the evidence needed to understand how temporary labour is requested, supplied, engaged, paid, attributed, reported and assured.

The scope is intentionally framed around the relationship between upper-chain requirements, where the parties are often exposed to procurement, tax, reporting, social value, modern slavery, fair-work, audit and public-accountability expectations, and lower-chain labour activity, where the parties create or hold the transaction data needed to evidence whether those expectations were satisfied.

Construction and infrastructure are used as primary reference environments because they make the evidence problem especially visible. They commonly involve project-based work, multi-party fulfilment, subcontracting, agency and intermediary labour, payroll-route variation, site-level records and client or framework reporting expectations.

Section 3

Regulatory Convergence

3.1 What regulatory convergence means

This paper uses the term regulatory convergence to describe the pattern identified through the reference-to-question mapping process. The references assessed do not create one single legal rule, nor do they apply to the same parties in the same way. They do, however, repeatedly require parties to understand, evidence or account for how temporary labour is engaged, treated, paid, taxed, attributed, reported or assured.

The convergence identified in this paper is therefore practical rather than formal. It arises from the combined direction of legislation, guidance, procurement policy, enforcement practice and market expectation. Those references differ in legal status and audience, but they increasingly depend on the same underlying evidence position: better visibility and control over the activity through which temporary labour becomes a worker-linked engagement, payment route, tax treatment, project attribution and accountable outcome.

The references considered include employment treatment, status treatment, tax compliance, transparent supply-chain pricing, HMRC labour supply-chain assurance, PAYE accountability for labour supply chains involving umbrella companies, worker-facing pay and deduction transparency, CIS fraud and known-or-should-have-known exposure, agency-worker and guaranteed-hours reform, Fair Work Agency inspection and enforcement powers, social value and fair-work monitoring, contract performance reporting, modern slavery and supply-chain risk management, responsible procurement, ESG and public defensibility.

The Reference-to-Question Evidence Map is the assistive research output of this document. It asks what the current and emerging landscape requires parties to know, understand and evidence, then translates those requirements into practical questions and evidence implications for temporary labour chains.

3.2 Upper-chain relevance

Upper-chain parties include buyers, contracting authorities, clients, procurement platforms, framework operators, consultants, principal contractors and main contractors. They create the requirement, control the route to market, define the acceptable labour outcome and carry the responsibility for overall compliance, reporting, assurance and public defensibility.

The upper chain cannot treat temporary labour as a supplier-level issue only. If it sets the requirement, relies on the outcome or reports the result, it needs evidence that the labour beneath it was engaged, treated, paid, taxed, attributed and evidenced correctly.

3.3 Lower-chain relevance

The lower chain is where the requirement becomes an economic event.

The critical moments are the formation of the worker-linked engagement and the processing of the associated payment. Those moments turn upper-chain obligations into real transactions with measurable consequences.

At that point, the outcome is fixed in fact: the worker was engaged, worked, paid, taxed, deducted from, invoiced, reported or corrected. Governance depends on connecting that lower-chain transaction to the upper-chain requirement in a reliable, attributable and reportable way.

3.4 Direction of travel change

Where obligations now attach to labour activity itself, it is no longer sufficient for the upper chain to rely on supplier approval, contractual flow-down, mandated performance, periodic audit or retrospective evidence gathering. Those methods may set expectations, but they do not prove what happened in the worker-linked transaction.

The market is moving toward lower-chain activity control, line-item transaction capture and upstream data reporting. Modern temporary labour governance now depends on evidence that shows whether the lower-chain engagement and payment outcome satisfied the upper-chain requirement.

The direction of travel is away from reliance on downstream enforcement alone and toward upstream evidence capable of showing what happened in the worker-linked transaction.

Section 4

The Supply-Line Evidence Model

4.1 Supply chains and visibility

Supply chains are tiered trees of commercial, contractual and operational relationships through which goods or services are procured, delivered, attributed, paid for and reported. Each tier adds another layer between the party setting the requirement and the party creating the outcome. The more layers a supply chain contains, the harder it becomes for upper-chain parties to see, control and evidence what is happening within it.

This visibility problem now matters across global supply chains. Businesses, public bodies, investors and regulators increasingly expect organisations to understand and manage the outcomes created by the chains they use, rather than relying only on immediate suppliers, contractual assurances or high-level declarations.

Some supply-chain requirements can still be managed through aggregated targets, downstream mandates and periodic assurance. In areas such as energy use, recycling, packaging, waste reduction or material sourcing, a buyer may set a target, require supplier declarations, audit a sample, or measure an overall outcome across the supply chain. For some requirements, that may be sufficient.

Other supply-chain outcomes are different. In certain manufacturing, regulated product, safety-critical and people-related sectors, the outcome is significant enough, serious enough or sufficiently connected to legal, ethical, tax, worker-facing or public-accountability consequences that aggregated assurance is not enough. Those outcomes require source-to-market evidence: the ability to understand the individual line item, trace the route through which it was created, identify the parties involved and evidence the outcome produced.

Regulatory convergence now places temporary labour within that second category. Employment treatment, tax accountability, worker-facing transparency, fair-work expectations, social value reporting and public defensibility depend on what happened in the individual worker-linked engagement and payment transaction. The evidential requirement is therefore source-to-market visibility at supply-line level.

4.2 Supply lines as the evidence unit

To meet source-to-market evidence requirements, supply chains need to be understood as collections of individual supply lines. A supply line is the route through which one requirement becomes one transaction, one outcome and one evidence record. It is the branch of the wider supply-chain tree where economic activity is actually generated.

Each supply line creates its own facts. For temporary labour it may involve a different supplier, agency, payroll company, payer, worker, project, engagement route, tax treatment, deduction pattern, worker-facing information, invoice and evidence state. Two supply lines may sit inside the same supply chain and support the same buyer requirement, but produce materially different legal, tax, ethical, commercial and assurance outcomes.

Each time a party performs a transaction that results in the engagement, work, payment, deduction, taxation, invoicing or reporting of a temporary worker, a supply line is opened. The economic activity becomes real, the upstream parties become connected to the outcome, and the evidence remains relevant for as long as the regulatory, contractual, tax, audit or reporting consideration remains live.

For context; a single buyer using two contractors, each contractor using two agencies, and each agency using two payroll companies creates between eight and fifteen worker-payment routes before individual workers, projects, pay periods, route changes or replacement suppliers are considered. In practice, a single supply chain can quickly contain many supply lines, each capable of creating its own transaction data, exposure and outcome.

Parties whose works result in the engagement and payment of temporary workers therefore need to understand their supply chains as supply lines. They need to map each line, monitor the creation of new lines, and capture the activity generated within those lines as ongoing evidence. Supply-line transaction evidence is the operating unit through which modern temporary labour governance becomes possible.

Section 5

The Reference-to-Question Evidence Map

5.1 Purpose of the map

Sections 2, 3 and 4 establish the operating position: temporary labour governance now depends on connecting upper-chain requirements to lower-chain activity through individual supply lines.

Once relevant parties have mapped those supply lines, they can begin to assess each transaction point, or source, against the wider regulatory, policy, procurement and enforcement landscape. The practical question is whether each supply line gives the relevant party access to the evidence data needed to satisfy each applicable reference.

The Reference-to-Question Evidence Map translates those references into practical evidence questions for temporary labour chains. It does not treat any reference as a complete data specification. Instead, it identifies what the supply line must be able to evidence if the relevant party is to answer the requirement, risk or accountability point created by that reference.

5.2 Reference integrity rules

The map is formed through practical interpretation. Most references do not prescribe a complete temporary-labour data model. They create obligations, expectations, risks or accountability points that need to be translated into evidence questions capable of being answered at supply-line level.

Each map entry follows a consistent structure. The reference position summarises what the reference says or does. The primary requirement owners identify the parties most likely to need the evidence. The lead question states the main evidence question created by the reference. The practical question set breaks that lead question into operational questions. The evidence implication identifies the assurance value created by the answers. The upper-chain use explains how the evidence may be used in procurement, reporting, audit, assurance or contract management. The interpretive boundary separates reference content from practical interpretation.

The map applies the following rules:

1. Reference position is separated from interpretation.
   The reference position summarises what the reference says or does. The interpretation explains the evidence question this creates for temporary labour governance.


2. Guidance, legislation, policy and consultation material are distinguished.
   Each reference is labelled by status where relevant.


3. Question sets are practical assurance tools.
   They identify what a buyer, contractor, agency, platform or assurance team may need to know in order to manage or evidence the issue. Legal determinations remain separate.


4. Evidence implication indicates assurance value, with liability handled separately.
   A field being useful for assurance may sit beyond a reader’s direct legal duty in a specific case.


5. The map is cumulative.
   Its value comes from showing that many references repeatedly require visibility over similar supply-line facts.

Section 5

The Reference-to-Question Evidence Map

5.3 Reference-to-Question Map

The map uses the following references as its basis:

5.3.1 DAO 04/26 - Tax Arrangements

DAO 04/26 is a government finance and tax direction for central government bodies. It is relevant to temporary labour because it connects major-project procurement with tax assurance, commercial viability, transparent supply chains and assurance across direct and indirect suppliers.

5.3.2 HMRC GfC12 - Labour supply-chain assurance

HMRC GfC12 is guidance on labour supply-chain assurance. It is relevant to temporary labour because it states that checking only immediate suppliers and customers may not be enough, and that organisations should understand how the chain operates, check before and during contracts, verify information where possible and keep records of the steps taken.

5.3.3 PAYE rules for labour supply chains involving umbrella companies from 6 April 2026

This HMRC guidance explains PAYE responsibility where an umbrella company employs workers in a labour supply chain. It is relevant because it identifies the agency with the end-client contract, or the end client where no agency exists, as responsible for making sure PAYE is operated correctly.

5.3.4 PAYE changes for the umbrella company market / Chapter 11 policy

This HMRC and HM Treasury policy explains the PAYE accountability changes for labour supply chains involving umbrella companies. It is relevant because it describes recruitment agency or end-client accountability, including joint and several liability, where an umbrella company forms part of the worker payment route.

5.3.5 Working through an umbrella company / agency worker Key Information Document guidance

This GOV.UK guidance concerns worker-facing information for agency workers and people working through umbrella companies. It is relevant because it focuses on key information, assignment rate, umbrella involvement, gross pay, net pay and deductions, all of which need to reconcile with the worker’s actual pay route and payslip.

5.3.6 Construction Industry Scheme fraud measures from 6 April 2026

This HMRC policy concerns Construction Industry Scheme fraud measures effective from 6 April 2026. It is relevant to temporary labour because CIS payment routes may require evidence of who made or received the payment, the nature of the work, the payment route and what the relevant party knew or should have known.

5.3.7 Zero-hours and similar contracts / agency-worker guaranteed-hours reforms

The zero-hours and agency-worker guaranteed-hours reforms concern greater security and predictability in flexible work. They are relevant to temporary labour because agency-worker rights may depend on evidence of hours worked for a hirer during a relevant reference period.

5.3.8 Modernising the Agency Work Regulatory Framework

The agency-work regulatory framework consultation recognises that agency and umbrella supply chains have become more complex than the original agency-worker model. It is relevant because it points toward the need to identify the actual role and accountability of each party in complex agency and umbrella supply lines.

5.3.9 Fair Work Agency enforcement statement

The Fair Work Agency enforcement statement explains the types of activity that may form part of labour-market investigations, including information requests, record inspection, interviews and premises visits. It is relevant because temporary labour chains need worker, pay, hours, deduction and labour-provider records that can be produced and reconciled under inspection pressure.

5.3.10 Employment agency record-keeping / FWA inspection guidance

This employment agency record-keeping guidance concerns the records agencies and employment businesses must keep to show compliance with relevant rules. It is relevant because agency records need to connect the worker, hirer, assignment and pay route in a form that can support inspection, assurance and dispute response.

5.3.11 PPN 002 - Social Value Model

PPN 002 and the Social Value Model apply to in-scope central government procurement. They are relevant to temporary labour because labour-linked social value commitments need evidence that connects contract delivery, worker route, pay or treatment outcome and reporting period.

5.3.12 Procurement Act 2023 - Key Performance Indicators guidance

The Procurement Act 2023 KPI guidance explains how supplier performance can be assessed during the life of a public contract. It is relevant where labour outcomes form part of contract performance, because those outcomes need contract-attributed, period-aligned evidence capable of being measured from transaction records.

5.3.13 Procurement Act 2023 - Contract Performance Notices

The Procurement Act 2023 Contract Performance Notices guidance forms part of the manage-phase transparency framework. It is relevant where labour-related performance information may need to support contract reporting, public transparency, platform reporting or supplier-performance governance.

5.3.14 PPN 009 - Tackling modern slavery in government supply chains

PPN 009 concerns the identification and management of modern slavery risk in government supply chains. It is relevant to temporary labour because labour-route visibility, worker-treatment indicators, deduction visibility and exception handling can all be needed to identify and manage modern-slavery risk indicators at supply-line level.

5.3.15 Umbrella payslip and pay-transparency guidance

This GOV.UK umbrella-worker and pay-checking guidance supports worker understanding of gross pay, net pay, hours, rates and deductions. It is relevant because payslip, deduction, rate and worker-information records need to reconcile with the supply-line route and payment information.

Section 6

Cross-Reference Question Clusters

6.1 Purpose of this section

The Reference-to-Question Evidence Map shows that different references, with different status, audiences and legal effects, repeatedly depend on the same underlying issue: whether upper-chain requirements can be connected to lower-chain labour activity through reliable supply-line evidence.

The recurring evidence points sit at transaction level. Relevant parties need to identify the worker, project, labour requester, supplier route, direct and indirect parties, employer or contracting party, payer, payroll or payment route, tax treatment, hours, pay, deductions, worker-facing information, accountable party and evidence state.

This section groups those recurring evidence points into cross-reference question clusters. Its purpose is to show where different references require visibility over the same worker-linked engagement and payment outcomes, and to identify the common data themes that supply lines need to capture, hold and report upstream.

6.9 Cross-reference evidence categories

Sections 6.2 to 6.8 show that the recurring questions can be grouped into common evidence categories. These categories are not a separate compliance standard and do not determine legal liability. They summarise the evidence areas that repeatedly appear across the references.

The practical finding is that the clusters repeatedly depend on the same underlying evidence areas. The references differ in status, audience and legal effect, but the evidence questions repeatedly return to worker-linked, route-specific, payment-aware, project-attributed and accountable supply-line facts.

At this point in the analysis, the requirement is clear. Temporary labour chains need to understand which evidence questions apply, where the relevant facts are created, which parties hold or control those facts, and whether the evidence can be connected back to the upper-chain requirement that the labour supports.

Once those evidence requirements are understood, parties can begin to assess how far existing governance methods are able to meet them. That assessment starts with the practical work of mapping supply lines, identifying the transaction points where key facts are created, controlling desired outcomes where possible, and gathering the evidence needed to support procurement, tax, worker-treatment, reporting, audit and accountability positions.

Section 7 therefore considers the practical constraints that arise when parties try to move from requirement to evidence capture.

Section 7

Evidence Capture Constraints

7.1 Purpose of this section

Section 6 identifies the recurring evidence categories that temporary labour chains need to answer across different references. Once those evidence requirements are understood, parties can begin to assess how far existing governance methods are able to meet them.

This section considers the practical constraints that arise when parties try to move from evidence requirement to evidence capture in real temporary labour chains. The constraints are not limited to whether parties know what to ask for. They include how far existing governance methods can reach, whether supply lines can be mapped without disrupting lower-chain commercial boundaries, whether downstream records can be separated from wider business activity, and whether key transaction facts are created early enough to support control rather than retrospective reconstruction.

7.2 Existing governance limits

Existing supply-chain governance methods include supplier approval, contractual flow-down, onboarding checks, declarations, questionnaires, audit rights, scorecards, contract reviews, periodic audits and retrospective evidence requests. Those methods remain useful as participation controls and expectation-setting tools. They define who may enter the chain, what standards suppliers are expected to meet and what information may be requested during contract operation or audit. They do not, by themselves, capture the individual worker-linked engagement and payment data now required by modern regulatory obligations. They are mostly supplier-level or contract-level governance methods.

7.3 Chain Mapping: An over-reach problem

Sections 3 and 4 explain why temporary labour governance now depends on connecting upper-chain requirements to lower-chain activity through individual supply lines. A supply chain is the wider commercial structure. A supply line is the specific route through which one labour requirement becomes one worker-linked engagement, one payment route, one tax or treatment outcome and one evidence record.

The first practical step is therefore chain mapping. Parties need to identify the organisations within the supply chain that create, control, administer or evidence temporary labour transactions generated by the buyer’s, client’s, framework operator’s or primary contractor’s works package.

That mapping needs to identify the visible supplier and the lower-chain parties involved in the relevant labour route. Depending on the route, those parties may include contractors, subcontractors, agencies, secondary agencies, managed-service providers, umbrella companies, payroll intermediaries, CIS payers, employment businesses, labour-only subcontractors and other parties involved in requesting, supplying, engaging, administering, paying, invoicing or reporting the worker-linked transaction.

The purpose is not to convert the whole supply chain into a single open-book relationship. The purpose is to identify the active supply lines through which temporary labour transactions are being created as a result of the upper-chain requirement, and to understand which parties create or hold the facts needed to evidence those transactions.

In principle, that process is simple. In practice, it can be difficult. Upper-chain parties often have a direct contractual relationship only with the supplier immediately below them. A buyer may contract with a main contractor. A main contractor may contract with a subcontractor or agency. The agency may then use another agency, umbrella company, payroll provider, CIS payer or other downstream party. Where there is no direct contractual relationship, direct mapping can create commercial and governance problems. Contacting or inspecting lower-chain parties directly may interfere with existing contractual boundaries, confidentiality duties, pricing sensitivity, supplier relationships, fair-competition expectations, framework rules, tender rules or procurement governance. It may also expose information about margins, client relationships, payment timing, worker allocation or commercial arrangements that the upper-chain party has no general right to inspect.

For that reason, chain mapping will often rely on supplier-provided statements, declarations, supply-chain schedules, onboarding information, audit responses and periodic assurance returns. Those tools can identify known parties and declared routes, but they may not provide ongoing visibility of every active supply line used during delivery.

Section 7 continued

7.4 Gross Totals: A separation problem

Once a supply chain has been mapped into relevant supply lines, the next constraint is whether downstream records can be separated and attributed to the upper-chain requirement. Temporary labour chains often settle through aggregated, pooled or gross-period records rather than clean worker-linked, project-linked or buyer-linked transaction records.

A subcontractor may pay an agency a total amount for labour supplied during a period. An agency may pay or instruct a payroll company for a wider group of workers. A payroll company may process workers across multiple agencies, clients, sites, projects and pay periods within the same payroll cycle. A lower-chain supplier may therefore hold accurate records for its own business while not holding them in a form that separates the buyer’s, client’s, framework operator’s or primary contractor’s specific labour activity from wider activity.

That structure creates an attribution problem. The total payment, invoice, payroll run or supplier account may be real, but the relevant evidential question is narrower: which individual worker-linked engagements were created because of the upper-chain works package, project, contract, lot, call-off or reporting obligation.

Without line-item attribution, a record may prove that money moved, payroll was processed, workers were paid or invoices were issued while failing to prove which buyer, contractor, project, work package, agency, worker, assignment, route, payer, pay period or reporting period the record supports.

This matters because Section 6 identifies evidence question categories that depend on worker-linked, route-specific, payment-aware and project-attributed facts. Aggregated records may support financial reconciliation between lower-chain parties, but they do not necessarily support upper-chain assurance where the relevant question is whether a specific temporary labour transaction satisfied a specific procurement, tax, worker-treatment, reporting or accountability requirement.

The practical constraint is that lower-chain records may exist, but still be too aggregated, pooled or gross to evidence the relevant supply line without further separation, attribution and reconciliation.

7.5 Delayed Formation: A structural timing problem

A further constraint arises from the way many temporary labour transactions are formed in payroll-intermediated routes. In practice, many temporary labour transactions are handled through agencies, umbrella companies, payroll intermediaries, CIS payers or other payment-facilitation parties. In the majority of cases, those parties do not create a fully particularised worker-linked transaction until after the work has been performed.

Instead, the worker may remain on supply under an ongoing employment contract, contract for services, subcontract agreement or other standing relationship. The labour transaction then occurs in fact before it is fully formed in paperwork. Timesheets, assignment details, rate confirmations, site information, approval records, status information and payment instructions are used afterwards to particularise the individual assignment, even though the work, direction, payment entitlement and route exposure have already been created.

That means the party responsible for payroll, payment facilitation or engagement paperwork may receive the key transaction facts retrospectively. The agency, contractor, site team or hirer may have scheduled, directed, supervised or approved the work before the payroll intermediary receives the complete worker, assignment, hours, rate, project, route and treatment information needed to complete the transaction record.

The result is a timing problem. The labour activity has already occurred before the individual engagement is fully particularised in the records of the party that processes or supports the payment route. The worker has worked, direction or supervision may have occurred, pay entitlement may have arisen, tax or treatment decisions may be practically committed, and worker-facing expectations may already have been created.

This retrospective formation model cannot structurally support full proactive control of treatments and outcomes. It may allow records to be completed, reconciled, corrected or audited after the event, but it cannot wholly prevent the wrong route, treatment, payer, deduction pattern, worker-facing information failure or project attribution failure from arising in the first place.

7.6 Section conclusion

Taken together, these evidence capture constraints reveal a significant structural mismatch. Modern regulatory obligations increasingly require upper-chain parties to understand, control and evidence supply-line activity, while many temporary labour chains still create, hold and release transaction evidence in fragmented, aggregated and retrospective forms.

Modern requirements increasingly expect upper-chain parties to understand the route, parties, worker-linked activity, payment treatment, tax position, project attribution and accountable party behind temporary labour outcomes. Those expectations assume that supply lines can be mapped, outcomes can be controlled and transaction evidence can be produced when needed.

Existing governance tools do not reliably deliver that position. Supplier approval, contractual flow-down, declarations, audit rights and retrospective evidence requests can set expectations, but they do not provide continuous visibility of active supply lines. Even where parties attempt to map those lines, the process is constrained by contractual distance, confidentiality, commercial sensitivity, fair-competition concerns, framework rules and the absence of direct lower-chain relationships.

Even where a supply line is identified, the evidence may not be usable. Lower-chain records may exist, but they may be aggregated, pooled or gross. They may prove that money moved, payroll was processed or workers were paid without proving which buyer, project, contractor, work package, worker, assignment, route, payer, pay period or reporting obligation the record supports.

Even where relevant data can be separated, it likely arrives too late. In most payroll-intermediated routes, the labour transaction occur in reality before it is fully formed in paperwork. The resulting evidence can support reconstruction, reconciliation and audit, but it cannot provide full proactive control over route, treatment, payer, deductions, worker-facing information, tax position or project attribution before exposure is created.

The current position therefore is that the market is largely incapable of meeting modern regulatory demands sustinably. The upper chain is being asked to evidence a level of transactional control that the lower chain is often not structured to generate, attribute or provide.

Section 8

Implications for Upper-Chain and Adjacent Parties

8.1 For public buyers and contracting authorities

The shift from downstream assurance to upstream evidence changes the buyer position. Public buyers and contracting authorities are increasingly expected to evidence the labour outcomes created beneath their contracts, frameworks, projects and work packages, not only the supplier appointments, policy statements or procurement records that sit above them.

That expectation is not abstract. DAO 04/26 points toward transparent, commercially viable and tax-aware supply chains. GfC12 warns that checking only immediate suppliers may not be enough. Procurement rules and guidance create reporting and performance-management expectations. Social value and modern slavery policy require evidence of workforce and supply-chain outcomes. Fair-work and enforcement direction increase the need for records that can survive scrutiny.

If the buyer cannot connect those expectations to the actual labour route, its position becomes exposed. It may report social value without worker-linked evidence, rely on modern slavery controls without route visibility, accept supplier performance without project-attributed labour data, or claim responsible procurement while the relevant pay, tax, deduction and worker-facing facts sit unresolved in the lower chain.

The consequence is a weaker public position. A buyer may face audit challenge, regulatory scrutiny, policy misalignment, reputational damage or poor public defensibility where temporary labour outcomes cannot be evidenced at supply-line level. The problem is not only whether a failure occurred. The problem is whether the buyer can show what happened when challenged.

8.2 For main contractors and principal contractors

Main contractors and principal contractors carry the sharpest operational consequence. They sit between the upper-chain requirement and the lower-chain labour market. They need agencies, payroll routes and flexible labour supply to deliver projects, but they also need evidence that the routes used beneath them are commercially viable, tax-aware, worker-transparent, project-attributed and defensible.

The exposure is direct and financially material. Umbrella PAYE rules and Chapter 11 policy can move accountability toward agencies and, in some cases, end clients, including joint and several liability where umbrella companies sit inside labour supply chains. CIS fraud measures create known-or-should-have-known exposure where payments are connected to fraud, with potential consequences for Gross Payment Status, tax loss and penalties. A contractor may not have created the failure, but it may still carry the consequence: the downstream umbrella, CIS payer, secondary agency or payroll intermediary creates the issue, while the contractor faces the client question, framework consequence, audit request, tax-risk review, dispute, press scrutiny or bid impact because the labour was used on its project or package.

This changes the commercial meaning of supply flexibility. A broad agency network may help delivery, but it can also multiply routes that are difficult to evidence. A tight preferred supplier list may improve control, but it can reduce labour availability, slow mobilisation, increase price pressure and weaken project performance. The contractor is forced into a harder operating trade-off: preserve supply flexibility and carry opaque-route risk, or restrict supply routes and carry delivery risk.

The tender consequence is equally serious. Contractors that cannot evidence labour-route control may become weaker bidders for public-sector projects, frameworks and major client environments. They may struggle to evidence tax assurance, fair-work commitments, modern slavery controls, social value delivery, KPI performance, worker treatment and audit readiness. The issue becomes commercial credibility, not only compliance.

Supply-line evidence therefore becomes a contractor resilience issue. It affects margin protection, supplier strategy, project delivery, bid quality, framework retention, client trust, dispute response and public defensibility. A contractor that cannot see, control or evidence its temporary labour routes is not only exposed to downstream failure. It is exposed to losing the right to use flexible labour confidently in regulated, public or high-scrutiny environments.

8.3 For procurement platforms and framework operators

Procurement platforms and framework operators sit at the point where buyer requirements are translated into supplier participation, categories, lots, call-offs, reporting fields, contract records and performance workflows.

A platform may help a buyer ask the right questions, collect declarations and organise supplier data, while having limited ability to evidence the labour outcomes created downstream. If the platform records the procurement intention but cannot connect that intention to supply-line evidence, it risks becoming administrative rather than evidential.

That matters because modern procurement is moving toward evidence of delivery, not only procurement design. KPI reporting, contract performance notices, social value commitments, modern slavery controls and responsible procurement expectations all create pressure for evidence that connects the framework, lot, contract or call-off to the actual labour activity underneath it.

Platforms do not need to become payroll systems. They do, however, risk losing relevance if they cannot receive, structure or display evidence outputs from systems closer to the labour transaction. The strategic role of the platform shifts from collecting supplier assertions to helping buyers understand whether the asserted labour outcomes can be evidenced.

8.4 For funders and insurers

Funders and insurers underpin large parts of the temporary labour market. They support invoice finance, payroll finance, credit risk, professional risk, employment-related exposure, contractual risk and wider commercial continuity. Their position depends on understanding what risk exists, where it sits and whether it can be attributed.

Supply-line evidence weakness makes that harder. If policyholders, borrowers or insured parties cannot count, track, attribute or control their own temporary labour outcomes, the funder or insurer may be supporting an exposure that the market participant itself cannot properly measure. The risk may sit inside PAYE accountability, CIS treatment, worker deductions, payroll failure, modern slavery indicators, employment-agency compliance, contract performance, recoverability or disputed labour charges.

Aggregated records weaken the risk picture. A payroll run, invoice batch or supplier account may show that money moved, but not which worker, project, route, payer, tax treatment, deduction pattern or accountable party created the exposure. That makes underwriting harder, diligence more intrusive, exclusions more likely, pricing more cautious and claims handling more difficult.

The claims consequence is especially important. Where an issue arises, the funder or insurer may need to understand whether the problem relates to one worker, one pay period, one supplier route, one project, one payroll company or a wider operating pattern. Without supply-line attribution, the exposure is harder to isolate and harder to defend.

The wider market consequence is increased cost of uncertainty. Parties that cannot evidence their supply lines may become more expensive to fund, harder to insure and more difficult to defend. Parties that can evidence worker-linked, route-specific, project-attributed and payment-aware labour activity may become more attractive risks.

8.5 Market-level implication

The implication across buyers, contractors, procurement platforms, funders and insurers is the same: temporary labour cannot continue to rely on supplier-level assurance where the relevant obligations now attach to supply-line outcomes.

The market does not only need more information. It needs a structural operating change. Supply lines need to be identified, controlled and evidenced while the labour activity is being created, not reconstructed after the route, payment, tax treatment, worker-facing outcome and exposure have already occurred.

The following sections therefore move from problem to solution. They set out the minimum supply-line evidence model, explain the practical relevance of controlled transaction data, and describe the maturity path from supplier declarations to a shared transaction evidence layer capable of supporting market-wide reliance.

Section 9

Minimum Supply-Line Evidence Model

9.1 Purpose of the minimum model

This section conceptualises what a minimum supply-line evidence model would need to look like if temporary labour chains were to support modern upper-chain assurance.

The model is not presented as an existing market standard. It is a practical evidence specification drawn from the requirements, constraints and consequences identified in the preceding sections. Its purpose is to identify the least evidence a credible supply line would need to generate, hold and report if buyers, contractors, platforms, funders, insurers and other exposed parties were to rely on it. Under that model, a supply line would not be treated as credible merely because labour was delivered, an invoice was issued, a supplier was approved or a declaration was received. It would become credible only where the core facts of the labour transaction could be identified, attributed, evidenced and reported to the party relying on the outcome.

The practical question is therefore what minimum evidence would be needed to show that temporary labour was requested by the relevant party, supplied through an identifiable route, engaged through an accountable party, paid through a known payment route, taxed on an evidenced basis, treated transparently, attributed to the correct project or contract, and supported by records capable of audit, correction and upstream reporting.

9.2 Evidence choke points

A minimum model would need to focus on the choke points where financial exposure, legal accountability and worker-treatment risk are created. These are the points at which a supply line would either become capable of assurance or become structurally difficult to defend.

These choke points matter because they are where liability, cost leakage, tax failure, pay failure, worker harm, procurement misstatement and reputational exposure are created. A supply line that cannot answer these questions may still deliver labour, but it cannot reliably support modern upper-chain assurance.

9.3 Minimum evidence categories

The choke points would translate into minimum evidence categories. These categories would define the operating evidence needed for buyers, contractors, platforms, funders, insurers and other exposed parties to rely on a temporary labour supply line.

9.4 Minimum reporting outputs

A minimum model would need to produce reliable evidence outputs without creating unrestricted visibility across every lower-chain commercial relationship.

Those outputs would allow a relevant party to identify whether the labour route is approved, restricted, unknown or not evidenced; whether PAYE, umbrella, CIS or another route is present and evidenced; whether worker-facing information has been provided and reconciled; whether project attribution is confirmed; whether tax calculation evidence is available; whether payment and deductions reconcile; and whether exceptions are open, corrected, escalated or unresolved.

The reporting output would translate lower-chain transaction facts into upper-chain assurance language. A buyer, contractor, platform, funder or insurer would be able to see the status of the supply line while unrelated pricing, margins, client lists, payroll populations and commercially sensitive records outside the relevant transaction remain outside the reporting view.

9.5 Minimum quality requirements

A minimum evidence model would depend on evidence quality as much as evidence content. A record would have limited assurance value where it exists in isolation but cannot be attributed, reconciled, tested or reported.

For a supply line to support modern assurance, the evidence would need to be worker-linked, route-specific, project-attributed, payment-aware, tax-treatment-aware, time-stamped, reconcilable, exception-capable, role-accessible and audit-ready.

Worker-linked evidence would connect the record to the relevant worker without exposing unnecessary personal data upstream. Route-specific evidence would identify the actual labour route used. Project-attributed evidence would connect the labour to the contract, framework, package or reporting obligation. Payment-aware and tax-treatment-aware evidence would show how money, deductions, tax calculations and payment responsibilities moved through the line. Time-stamped and reconcilable evidence would show when the facts were created and whether they matched across records. Exception-capable evidence would record failure, correction and dispute. Role-accessible evidence would allow each party to see the facts relevant to its obligation while keeping unrelated lower-chain commercial activity outside the reporting view.

A supply line that failed to meet these minimum conditions could still deliver labour, but it would remain structurally weak as a basis for modern upper-chain assurance.

Section 10

Practical Relevance of Controlled Transaction Data

10.1 Why transaction timing matters

The minimum evidence model would require more than retrospective evidence gathering. Late evidence may support reconstruction, reconciliation and audit, but it leaves the route, payment, tax treatment, worker-facing information, deduction position and project attribution exposed until after the labour activity has already created the outcome.

This timing issue is central to temporary labour governance. Where the labour transaction occurs before the evidence is created, the market is left auditing exposure rather than controlling it. The transaction has already produced a worker outcome, a payment expectation, a tax position, a reporting consequence and a potential liability position.

The practical requirement would therefore be controlled transaction data: evidence created through the operating process that requests, supplies, approves, works, pays, taxes, invoices and reports the labour transaction.

10.2 Controlled transaction data

Controlled transaction data would be worker-linked, route-specific, project-attributed and payment-aware data created as part of the process through which temporary labour activity becomes economically real.

An audit pack is usually assembled after the event from documents that may or may not reconcile. Controlled transaction data would be created as the transaction progresses, so that the supply line records the facts needed for assurance at the point those facts are created.

In practical terms, controlled transaction data would connect the labour request, supplier route, assignment, worker-facing information, route approval, work record, timesheet, pay calculation, tax calculation, deduction treatment, payment, invoice, reporting output, exception record and correction history.

The purpose would be to make temporary labour flexibility evidentially safe. Agencies, contractors, payroll operators and intermediaries could continue to perform different roles, while the core facts of the transaction are captured in a form capable of attribution and reliance by the parties exposed to the outcome.

10.3 Single source of market truth

A sustainable evidence position would require a single source of market truth for the temporary labour transaction.

That concept means a shared transaction evidence layer that allows each authorised party to rely on the same verified supply-line facts, with access limited to the facts relevant to that party’s role, obligation and risk position.

The buyer may need contract, route, social value, KPI and assurance status. The contractor may need supplier, route, payer, tax, project and exception data. The agency may need worker, assignment, engagement and worker-facing records. The payroll operator may need pay, deduction, tax and payslip data. The funder may need debtor, invoice, payment-route and recoverability evidence. The insurer may need risk category, evidence state, exception state and claim-defensibility information.

Each party would see a different role-based view, while relying on the same underlying transaction facts.

10.4 Role-based reliance without open-book exposure

Section 7 identifies overreach as a structural barrier. Upper-chain parties may need evidence from lower-chain activity, while direct inspection of downstream relationships can interfere with confidentiality, pricing sensitivity, supplier relationships, framework rules, tender governance and commercial boundaries.

A controlled transaction evidence layer would separate evidence reliance from unrestricted commercial disclosure. It would make the relevant transaction facts available to the relevant party while keeping unrelated lower-chain activity outside the reporting view.

A buyer would need assurance that labour used on its project was routed, paid, taxed and evidenced properly. A contractor would need assurance that the route used for its package was controlled and attributable. A funder or insurer would need assurance that the funded or insured exposure could be counted, tested and defended. None of those positions would require open access to every payroll record, supplier relationship or commercial arrangement in the wider chain.

The operating principle would be role-based reliance. Each party would receive the evidence needed for its obligation and risk position, while the market preserves commercial boundaries and avoids converting temporary labour governance into a full open-book disclosure exercise.

10.5 Practical relevance

The practical relevance of controlled transaction data would be the reduction of the gap between obligation and evidence.

Supply lines could be approved, restricted or challenged before exposure becomes embedded. PAYE, umbrella and CIS defensibility would be stronger. Funds flow, deductions and worker-cost leakage would be more visible. Worker-facing transparency and pay-route understanding would improve. Labour activity would connect more reliably to projects, contracts, frameworks, KPIs and social value measures. Funders and insurers would have a clearer view of exposure. Procurement platforms would receive stronger evidence outputs. Contractors would have a stronger route between labour flexibility and client defensibility.

The most important change would be timing. Controlled transaction data would move assurance away from asking what happened after the event and toward controlling what is allowed to happen while the supply line is active.

That would be the practical operating change required by modern temporary labour governance.

Section 11

Evidence Maturity Model

11.1 Purpose of the maturity model

The evidence maturity model would describe the market transition from supplier assurance to controlled transaction evidence.

Its purpose would be to show how temporary labour chains could move from supplier assertions and retrospective documents toward supply-line evidence created, attributed and shared early enough to support the party carrying the obligation.

The maturity question would be whether evidence was created early enough, attributed clearly enough and shared reliably enough to support the party relying on the labour outcome.

11.2 Evidence maturity levels

11.3 Interpretation of the model

The model would show why supplier-level assurance has limited value under upstream evidence expectations. Supplier assertions and documentation may remain useful, but they sit too far away from the worker-linked transaction to support the full range of modern procurement, tax, worker-treatment, social value, modern slavery, audit and funding expectations.

Retrospective audit packs would improve the position, but they would remain reactive. They would help parties explain what happened after the labour activity occurred, while leaving route, payer, tax treatment, deduction position, worker-facing information and project attribution exposed before the evidence is assembled.

Attributed supply-line evidence would be the first meaningful step toward modern assurance. It would connect the evidence to the relevant worker, route, payer, project, period and accountable party. It would allow the upper chain to understand which transaction created which outcome.

Controlled transaction evidence would create a stronger position. It would create evidence as part of the operating process itself, allowing parties to identify route failures, missing information, tax-sensitive treatments, worker-facing gaps, project-attribution failures and payment exceptions while the supply line is still active.

Shared market truth would represent the highest maturity state. It would allow different parties to rely on the same core transaction facts without each party recreating, requesting or independently reconciling the evidence after the event.

11.4 Section conclusion

Temporary labour governance is moving from supplier declarations and retrospective assurance toward controlled transaction evidence capable of supporting upstream reliance.

This would not require every party to own every process. It would require the supply line to produce evidence that the relevant party can rely on. The buyer would need evidence for procurement and public defensibility. The contractor would need evidence for project delivery, route control and financial exposure. The platform would need evidence outputs that support framework and contract reporting. The funder and insurer would need evidence that risk can be counted, attributed and defended. The worker would need transparency over pay, deductions, route and challenge rights.

The sustainable market position would be controlled supply-line transaction evidence: a worker-linked, route-specific, project-attributed, payment-aware and tax-aware evidence layer that allows each party to rely on the same core facts while unrelated lower-chain commercial activity remains outside the reporting view.

Section 12

Conclusion

This paper’s finding is that modern temporary labour governance is moving from downstream supplier mandates to upstream supply-line transaction evidence.

The temporary labour market can no longer be understood only through supplier approval, contractual flow-down, declarations, retrospective audit packs or downstream compliance mandates. Those methods remain useful, but they do not provide the evidence now required to show what happened in the worker-linked transaction where the labour outcome was formed.

The relevant evidence sits inside the supply line. It is created when a labour requirement becomes a worker engagement, a route decision, a payment route, a tax treatment, a deduction position, a worker-facing record, a project attribution and an accountable outcome.

The references assessed in this paper differ in status, audience and legal effect, but they repeatedly return to the same operating requirement: parties need clearer evidence of who supplied the worker, who engaged the worker, who paid the worker, how the worker was treated, which tax or payment route was used, which project or contract the labour supported, and whether the records are present, attributable, reconciled and capable of upstream reliance.

Temporary labour assurance therefore needs to move closer to the point where exposure is created. The market needs evidence that is worker-linked, route-specific, project-attributed, payment-aware, tax-aware, time-stamped, exception-capable and capable of controlled upstream reporting.

The upper chain owns the requirement.
The lower chain creates the transaction.
The supply line is the evidence route between the two.

Appendix A

Appendix A - Reference Register

This register records the core references used for the Reference-to-Question Evidence Map. It should be maintained as a controlled evidence register. Dates and reference status should be rechecked before external publication.

Appendix B

Appendix B - Reference-to-Requirement Extraction Table

This appendix separates the reference-derived requirement from the document’s interpretation. It is designed to protect credibility by avoiding implied overstatement.

Appendix E

Appendix E - Non-Legal Interpretation Note

This document is a research and strategy paper for evidence interpretation. Legal, tax, procurement, employment, audit, financial, funding, insurance, ESG, social value and compliance advice require professional review.

The reference interpretations identify practical evidence questions. Liability, employment status, tax status, procurement compliance, social value compliance and regulatory breach require separate determination.

Readers should obtain appropriate professional advice before relying on any conclusion for legal, tax, procurement, employment, audit, financial, insurance, funding, ESG, social value or compliance purposes.

Reference notes

Reference notes and references

1. Recruitment and Employment Confederation, Recruitment Industry Status Report 2024/25 public summary and press release, reporting £40.6bn GVA, 76.7% sector GVA from temporary/contract placements, and around 872,000 temporary or contract workers on assignment on any given day in 2024. https://www.rec.uk.com/our-view/research/recruitment-and-industry-status-report/uk-recruitment-industry-status-report-202425 and https://www.rec.uk.com/our-view/news/press-releases/recruitment-sector-contributes-more-40-pounds-billion-year-uk-economy-despite-tough-job-market↩︎

2. HM Treasury / Cabinet Office, DAO 04/26 Tax Arrangements, published 10 June 2026. https://www.gov.uk/government/publications/dao-0426-tax-arrangements/dao-0426-tax-arrangements↩︎

3. HMRC, Help with labour supply chain assurance - GfC12: recommended approach to assurance, updated 16 January 2025. https://www.gov.uk/guidance/help-with-labour-supply-chain-assurance-gfc12/recommended-approach-to-assurance↩︎

4. HMRC, PAYE rules for labour supply chains that include umbrella companies from 6 April 2026, published 17 September 2025 and updated 19 June 2026. https://www.gov.uk/guidance/paye-rules-for-labour-supply-chains-that-include-umbrella-companies-from-6-april-2026↩︎

1. HMRC / HM Treasury, PAYE changes for the umbrella company market, published 26 November 2025, and HMRC Employment Status Manual ESM2405. https://www.gov.uk/government/publications/paye-changes-for-the-umbrella-company-market and https://www.gov.uk/hmrc-internal-manuals/employment-status-manual/esm2405↩︎

2. UK Government, Working through an umbrella company; UK Government, Agency workers: your rights - basic information you should receive; and Key information document: guidance for agency workers paid through umbrella companies. https://www.gov.uk/guidance/working-through-an-umbrella-company, https://www.gov.uk/agency-workers-your-rights/basic-information-you-should-receive and https://www.gov.uk/guidance/key-information-document-guidance-for-agency-workers-paid-through-umbrella-companies↩︎

3. HMRC, Construction Industry Scheme: tackling fraud, published 26 November 2025; and HMRC Manual CISR85010. https://www.gov.uk/government/publications/construction-industry-scheme-tackling-fraud and https://www.gov.uk/hmrc-internal-manuals/construction-industry-scheme-reform/cisr85010↩︎

4. UK Government, Factsheet: Reforms of zero-hours and similar contracts, 2026; Department for Business and Trade, Ending one-sided flexibility: consultation document, 2 June 2026; Employment Rights Act 2025. https://assets.publishing.service.gov.uk/media/6a1d6024c7335e2ca6daad8c/zero-hours-contracts.pdf, https://assets.publishing.service.gov.uk/media/6a22e4b056e988a798b3870d/ending-one-sided-flexibility-reforms-zero-hours-similar-contracts-consultation-document.pdf and https://www.legislation.gov.uk/ukpga/2025/36↩︎

1. Department for Business and Trade, Make Work Pay: modernising the Agency Work Regulatory Framework, published 6 February 2026. https://www.gov.uk/government/consultations/make-work-pay-modernising-the-agency-work-regulatory-framework↩︎

2. Department for Business and Trade / Fair Work Agency, Fair Work Agency enforcement statement, published 19 May 2026. https://www.gov.uk/government/publications/fair-work-agency-enforcement-policy-statement/fair-work-agency-enforcement-statement↩︎

3. UK Government, Record keeping for employment agencies and businesses. https://www.gov.uk/record-keeping-for-employment-agencies-and-businesses/inspections-and-enforcement-of-the-rules and https://www.gov.uk/record-keeping-for-employment-agencies-and-businesses/storing-and-accessing-records↩︎

4. Cabinet Office, PPN 002: The Social Value Model and Guide to using the Social Value Model, published 5 March 2025. https://www.gov.uk/government/publications/ppn-002-taking-account-of-social-value-in-the-award-of-contracts/procurement-policy-note-002-the-social-value-model-html and https://www.gov.uk/government/publications/ppn-002-taking-account-of-social-value-in-the-award-of-contracts/ppn-002-guide-to-using-the-social-value-model-html↩︎

1. Cabinet Office, Procurement Act 2023 guidance: Key Performance Indicators, updated 20 April 2026. https://www.gov.uk/government/publications/procurement-act-2023-guidance-documents-manage-phase/guidance-key-performance-indicators-html↩︎

2. Cabinet Office, Procurement Act 2023 guidance: Contract Performance Notices, updated 20 April 2026, and New legislative requirements under the Procurement Act 2023. https://www.gov.uk/government/publications/procurement-act-2023-guidance-documents-manage-phase/guidance-contract-performance-notices-html and https://www.gov.uk/government/publications/procurement-act-2023-short-guides/new-legislative-requirements-under-the-procurement-act-2023-html↩︎

3. Cabinet Office, PPN 009: Tackling modern slavery in government supply chains, updated 16 October 2025; PPN 009 Guidance on tackling modern slavery in government supply chains; and ARTT guidance. https://www.gov.uk/government/publications/ppn-009-tackling-modern-slavery-in-government-supply-chains, https://www.gov.uk/government/publications/ppn-009-tackling-modern-slavery-in-government-supply-chains/ppn-009-guidance-on-tackling-modern-slavery-in-government-supply-chains-html and https://www.gov.uk/government/publications/ppn-009-tackling-modern-slavery-in-government-supply-chains/anti-slavery-risk-tiering-tool-artt-guidance↩︎

4. UK Government, Working through an umbrella company and Work out pay from an umbrella company. https://www.gov.uk/guidance/working-through-an-umbrella-company and https://www.gov.uk/guidance/work-out-pay-from-an-umbrella-company↩︎