Modern Slavery Act Compliance for UK Procurement Teams: A Practical Guide (2026)

The Modern Slavery Act 2015 was a landmark piece of UK legislation — the first of its kind to require large businesses to report annually on the steps they are taking to prevent forced labour and human trafficking in their operations and supply chains. A decade on, the obligations are better understood, but compliance remains uneven, and the reputational and regulatory pressure on UK businesses has only grown.

The Act's transparency statement requirement formally applies to commercial organisations supplying goods or services in the UK with an annual turnover of £36 million or more. But the practical reach of the legislation extends far beyond that threshold. Any business that supplies into a large organisation's supply chain will increasingly face Modern Slavery due diligence questionnaires, document requests and contractual obligations from those larger customers — regardless of their own turnover. Procurement teams in SMEs and mid-market businesses are discovering that "our turnover is below the threshold" is not, in practice, a sufficient answer when a major customer asks what you have done to check your suppliers.

Getting this wrong carries real consequences: reputational damage if suppliers are found to have exploitative practices, contractual liability with customers who require compliance warranties, and — for in-scope organisations — the possibility of Home Office scrutiny and public naming in enforcement communications.

What Does the Modern Slavery Act Require from UK Businesses?

For organisations that meet the turnover threshold, the core obligation is to publish an annual Modern Slavery and Human Trafficking Transparency Statement. This must be approved by the board (or equivalent governing body) and signed by a director. It must be published on your website with a prominent link from your homepage, and submitted to the Government's Modern Slavery Statement Registry.

The Home Office guidance recommends that the statement addresses six areas:

• Organisation structure, business and supply chains — a clear description of your business, what you buy, and who you buy it from
• Policies in relation to slavery and human trafficking — your internal codes of conduct, supplier codes and whistleblowing arrangements
• Due diligence processes — how you assess and manage risk in your supply chain, including the processes you use to identify and act on concerns
• Risk assessment and management — which parts of your supply chain carry the highest risk and what you have done about it
• Key performance indicators — how you measure effectiveness, such as supplier assessment completion rates or training coverage
• Training and capacity building — the training provided to procurement staff and others involved in sourcing decisions

Statements must be published within six months of the financial year end and updated annually. The Modern Slavery Statement Registry, managed by the Home Office, allows the public, investors, NGOs and customers to review and compare statements. Statements that are vague, out of date or missing entirely attract increasing scrutiny from civil society organisations that actively monitor the registry.

The Supply Chain Due Diligence Challenge

Many procurement teams find that their Tier 1 supplier base — the direct suppliers they contract with and pay — is relatively manageable. You know who they are, you have contracts with them, and you can send them a questionnaire.

The real complexity begins at Tier 2 and beyond. Your direct suppliers have their own supply chains, often reaching into countries or sectors where the risk of forced labour, debt bondage or trafficking is meaningfully higher. A food manufacturer you buy from may source ingredients from agricultural regions with documented labour abuses. A cleaning services contractor may sub-contract to agencies with opaque recruitment practices. A logistics provider may use haulage sub-contractors with driver welfare concerns.

You are not expected to have perfect visibility of every tier in your supply chain — that is not realistic. But the Home Office and civil society organisations do expect you to demonstrate that you understand where your highest-risk exposure lies and have taken proportionate steps to address it.

Sectors that consistently attract elevated scrutiny include:

• Construction and civil engineering (particularly subcontractor labour)
• Food production, agriculture and food processing (seasonal and migrant labour)
• Clothing, textiles and apparel manufacturing
• Consumer electronics and component manufacturing
• Facilities management, cleaning services and care sector staffing agencies

If your supply chain touches any of these sectors, your due diligence programme needs to reflect that elevated risk with proportionate investigation, not just a blanket questionnaire sent to every supplier.

A Practical Modern Slavery Risk Assessment Framework for UK Procurement

A structured risk assessment process does not need to be complex. The following framework gives procurement teams a repeatable approach that can be documented, audited and updated annually.

1. Map your supply chain. Start with a complete list of active suppliers across all categories. For each supplier, capture the country of origin or production, the sector, and the nature of the goods or services provided. Even a basic supplier register in a structured format is a significant step forward for organisations currently relying on spreadsheets or finance system exports.
2. Categorise by risk level. Combine three risk dimensions: country risk (using publicly available sources such as the Global Slavery Index), sector risk (informed by the high-risk sectors above), and product or service risk (the complexity of the supply chain behind the product). A supplier in a low-risk country in a low-risk sector can reasonably receive a lighter-touch review. A supplier in a high-risk country in a high-risk sector warrants direct engagement and documentary evidence.
3. Conduct supplier assessments. For higher-risk suppliers, issue a Modern Slavery self-assessment questionnaire and request supporting documentation (see the next section). For lower-risk suppliers, a shorter declaration or contractual commitment may be proportionate. Document your decisions and the evidence received.
4. Remediation process. Define what happens when a supplier cannot meet your requirements or where a concern is identified. This may involve an improvement plan with a fixed timeline, escalation to the board, or — in serious cases — supplier exit. The existence of a clear remediation process is itself evidence of a mature programme.
5. Annual review. The Act requires annual reporting, and your assessments should refresh on the same cycle. Flag suppliers where certifications or policies are approaching expiry. Reassess the risk profile if your supply chain changes materially — new categories, new geographies, acquisitions.

Key Documents to Collect from Suppliers

Requesting documents from suppliers is only useful if you actually store, track and review them. The following are the key items that procurement and compliance teams should be collecting for higher-risk suppliers:

• Modern Slavery policy or statement — a written policy committing to the prevention of forced labour and human trafficking, signed by a senior leader. For large suppliers in scope of the Act, this should link to their published annual statement.
• Ethical trading certification — third-party certification against recognised ethical trading standards provides a level of independent assurance. Relevant standards include the Ethical Trading Initiative (ETI) Base Code, SA8000, and sector-specific certifications such as Fairtrade or Rainforest Alliance where applicable.
• Third-party audit reports — for high-risk suppliers, an independent social compliance audit (such as a SMETA or Sedex audit) provides meaningful evidence beyond a self-declaration.
• Self-assessment questionnaire responses — a structured questionnaire covering labour practices, recruitment processes, pay and working hours, grievance mechanisms, and sub-contractor management, completed by the supplier and retained on file.

Critically, all of these documents have expiry dates or renewal cycles. A policy signed in 2022 is not evidence of current practice. Your system needs to track when each document was received and flag when it is due for renewal.

Common Mistakes in UK Supply Chain Modern Slavery Compliance

After working with UK procurement teams across a range of sectors, the same patterns of weakness recur. Understanding them helps you avoid the same traps.

• Tick-box transparency statements.A statement that simply says "we are committed to the prevention of modern slavery" and lists your policies without any evidence of supplier engagement or risk assessment will not withstand scrutiny. Civil society organisations that review the registry specifically flag vague statements as inadequate.
• No meaningful supplier engagement. Issuing a questionnaire to every supplier on a mailing list and filing the responses without review is not due diligence — it is paperwork for its own sake. Effective compliance requires proportionate engagement, with higher-risk suppliers receiving deeper scrutiny.
• Failure to update annually. Outdated statements on the Home Office registry are a specific focus of enforcement communications. If your statement relates to a financial year that ended 18 months ago, you are not compliant.
• No audit trail for due diligence activities. If a customer, investor or regulator asks how you assessed a specific supplier, can you produce a documented record? Compliance that exists only in email inboxes and shared drives is not reliably retrievable when it matters.

How Technology Can Help

For small teams managing a large supplier base, the administrative burden of Modern Slavery compliance can feel genuinely unmanageable — especially when it is one obligation sitting alongside GDPR supplier contracts, ISO documentation, Scope 3 data collection, and the day-to-day workload of procurement. This is where purpose-built supplier management software changes the picture.

A platform like Supplio addresses the core operational challenges:

• Centralised document store. Every Modern Slavery policy, ethical trading certificate, audit report and self-assessment questionnaire is stored against the relevant supplier record — searchable, version-controlled and accessible to the whole team rather than buried in a shared inbox.
• Automated expiry reminders.When a supplier's Modern Slavery policy is due for renewal, Supplio sends automated reminders — to your team and optionally to the supplier directly — before the document lapses. You stop relying on someone remembering to check a spreadsheet.
• Supplier self-service portal. Rather than chasing suppliers by email to upload documents, your suppliers log in to their own supplier portal and submit documents directly against their profile. The document is immediately visible to your team, logged with a timestamp, and ready for review.
• Full audit trail. Every document received, every questionnaire submitted, every compliance decision taken is logged with a timestamped record. When a customer or auditor asks for evidence of your due diligence process, you can produce it in minutes rather than hours.

The goal is not to automate away human judgement — decisions about remediation and supplier relationships still require experienced people. The goal is to eliminate the administrative friction that currently stops UK procurement teams from doing those things well.

For more on how Supplio handles compliance workflows and document management, explore the full feature set.