UK Sustainability Reporting: The Audit Committee Checklist

UK Sustainability Reporting Standards make sustainability governance an audit committee responsibility in 2026, not a finance-team add-on.

The Department for Business and Trade published UK SRS S1 and UK SRS S2 on 25 February 2026, transposing the International Sustainability Standards Board’s (ISSB) IFRS S1 and S2 into a UK framework. The Financial Conduct Authority (FCA) is now consulting on writing UK SRS into the Listing Rules, and the Financial Reporting Council (FRC) has signalled it will monitor early adopters closely. For audit committees, this converts sustainability disclosure from a communications exercise into a governance obligation that sits alongside financial statement approval, with the same expectation of challenge, evidence and sign-off.

This governance angle builds on our earlier briefing on UK Sustainability Reporting Standards for CFOs, which covered the financial reporting mechanics. Here the focus is the audit committee’s oversight duty, not the accounting process.

What are the UK Sustainability Reporting Standards, and why do they land on the audit committee’s desk?

UK SRS S1 sets general requirements for disclosing sustainability-related financial information across governance, strategy, risk management, and metrics and targets; UK SRS S2 covers climate-related disclosures specifically. Both standards are voluntary for now, but that window is closing. According to the Department for Business and Trade, UK SRS S1 and S2 were published on 25 February 2026, built to align closely with the ISSB’s global baseline so companies reporting under both frameworks avoid duplicated effort. According to the FCA, its consultation on incorporating UK SRS into the Listing Rules closed on 20 March 2026, the mechanism by which voluntary becomes mandatory for in-scope issuers.

The governance content of UK SRS S1 is explicit: boards must show they have actively challenged and approved the sustainability claims being made, not simply received a report. That formulation, challenge and approve, is audit committee language, not marketing language, which is why so many boards are routing oversight through the audit committee rather than creating a standalone ESG committee.

Executive Action:

• Confirm who on the board currently owns sustainability disclosure sign-off, and whether that mandate is written into the audit committee’s terms of reference.
• Map UK SRS S1’s four pillars — governance, strategy, risk management, metrics and targets — against existing audit committee reporting lines.
• Ask management for the evidence trail behind any sustainability claim already published this year.

What must the audit committee actually challenge and approve under UK SRS S1?

Four things need the committee’s specific challenge and approval. First, governance: does the board collectively have the skills to interpret material sustainability matters, or does it need external assurance support? Second, strategy: are climate and sustainability risks described as they would be for any other principal risk, with quantified exposure rather than narrative? Third, risk management: is the process for identifying sustainability risk integrated into the existing enterprise risk framework, or bolted on separately? Fourth, metrics and targets: are the numbers behind disclosed targets auditable, including data provenance from suppliers?

Audit committees that have handled TCFD-aligned climate disclosures under the Companies Act 2006 strategic report requirements already have a head start; UK SRS S2 extends rather than replaces that work. The new discipline is applying the same scepticism to sustainability metrics that the committee already applies to revenue recognition or impairment judgements.

Executive Action:

• Request a gap analysis between current TCFD-aligned disclosures and full UK SRS S1/S2 requirements.
• Set a standing agenda item for sustainability assumptions alongside going-concern and impairment papers.
• Identify which disclosed metrics currently lack third-party assurance, and prioritise those for external review.

How should audit committees resource ESG assurance without duplicating the CFO’s reporting process?

The temptation is to treat UK SRS as a second reporting cycle running parallel to statutory accounts. That duplicates cost and risks inconsistent numbers reaching the market through different channels. The better model treats sustainability data with the same controls environment as financial data: one source of truth, reviewed by internal audit, tested by external assurance providers where required, and presented to the audit committee alongside the annual report timetable, not separately from it.

According to PwC’s governance research on audit committee practice, boards are increasingly leaning on the audit committee for ESG oversight specifically because it already has the numerical literacy and independence to interrogate assumptions, rather than building a parallel structure from scratch. That argues for integration, not a bolt-on committee.

Executive Action:

• Align the sustainability reporting timetable with the statutory audit timetable rather than running it separately.
• Extend internal audit’s scope to cover sustainability data controls, not just financial controls.
• Clarify which findings go to the audit committee versus a risk committee, so nothing falls between the two.

What happens once the FCA writes UK SRS into the Listing Rules?

Once the FCA’s consultation closes and rules are finalised, UK SRS moves from available for voluntary use to a Listing Rule obligation for in-scope issuers, with the compliance and disclosure timetable that implies: comply-or-explain in the near term, likely tightening over subsequent reporting cycles, following the pattern set by TCFD-aligned reporting under the Companies Act 2006. Audit committees that wait for the rule to be finalised before building the governance evidence trail will be reporting retrospectively, under time pressure, on assumptions nobody tested in real time.

The FRC’s existing supervisory approach to corporate reporting, reviewing disclosures against stated policy and querying weak evidence, is the model likely to extend to UK SRS compliance once it becomes mandatory. Committees that can already show a documented, minuted challenge process will be in a materially stronger position than those assembling the paper trail after the fact.

Executive Action:

• Build the audit committee’s UK SRS minute trail now, ahead of mandatory adoption, not after the FCA finalises rules.
• Brief the committee chair on likely FRC supervisory questions before this year’s annual report is signed off.
• Use INFORMD’s capital approval and technology strategy review templates as a starting structure for documenting sustainability governance evidence.

For a video briefing on board-level sustainability governance, see our video library, or contact our team to discuss committee-specific implementation. To pressure-test your committee’s broader governance readiness, INFORMD’s executive self-assessment tools are a useful starting point.

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