UK SRS implementation: a practical roadmap

Where things stand, and why timing matters

The Department for Business and Trade published UK SRS S1 and S2 on 25 February 2026, making them available for voluntary use^[1].

There is no obligation to apply them yet. The FCA has proposed, in CP26/5, that in-scope listed companies report against UK SRS S2 for accounting periods beginning on or after 1 January 2027^[2].

Until the FCA publishes its Policy Statement, expected in autumn 2026, those dates are proposals rather than law^[2].

For companies likely to fall in scope, the practical point is that the first mandatory year should not also be the first time the data, governance and controls exist.

That is the case for starting an implementation programme now.

Climate first: why S2 leads and S1 follows

UK SRS S2 is the first detailed application of the general framework set out in UK SRS S1, and the proposed timeline reflects that^[5].

CP26/5 proposes UK SRS S2 climate disclosures (excluding Scope 3) for periods beginning on or after 1 January 2027, Scope 3 on a comply-or-explain basis from 1 January 2028, and UK SRS S1 non-climate disclosures on a comply-or-explain basis from 1 January 2029^[2].

Sequencing your own programme the same way is the sensible default: build governance, data and assurance capability on climate first, then extend the same machinery across the wider sustainability topics that S1 brings in.

A sensible implementation pathway

No primary source fixes how long each stage takes, so this is a logical order rather than a fixed schedule.

Work backwards from your likely first mandatory period and give the hardest stages — Scope 3 data and scenario analysis — the most runway.

1. Scope assessment. Establish whether, and when, you are likely to be caught. CP26/5 proposes that in-scope companies sit within UK Listing Rules categories 6, 16 and 22^[2]. Confirm your category, your accounting period dates and therefore your probable first reporting year.

2. Materiality. UK SRS uses an enterprise-value (single-materiality) lens — sustainability risks and opportunities that could reasonably affect the company’s prospects^[1]. Identify which climate matters are material now, and which sustainability topics will become relevant when S1 applies.

3. Governance. Establish board oversight and management responsibility for sustainability matters — the governance pillar of the four-pillar structure — and the internal accountabilities that sit beneath it.

4. Data and systems for Scope 1, 2 and 3. Stand up the measurement systems. Scope 1 and 2 are usually tractable; Scope 3 value-chain emissions follow the GHG Protocol’s Corporate Value Chain Standard and are the harder, longer build^[6].

5. Scenario analysis. Assess resilience under different climate pathways, as the strategy pillar requires. This typically takes longer than expected and is best started early.

6. Draft the four-pillar disclosures. Pull governance, strategy, risk management, and metrics and targets into a coherent disclosure that ties back to the business and the accounts.

7. Assurance readiness. Build data and controls to an assurable standard, with reference to the FRC’s voluntary ISSA (UK) 5000^[4], even where assurance is not yet required.

The four pillars your disclosure must cover

UK SRS S2 keeps the four-pillar structure inherited from the TCFD recommendations and carried through IFRS S2^[5].

Each stage of the roadmap feeds one or more of these pillars.

Designing the programme around them keeps the work pointed at the disclosure you ultimately have to produce.

Tie it to the financial statements from the start

UK SRS S1 requires sustainability-related financial disclosures to be for the same reporting entity as the related financial statements, and to be provided as part of the general purpose financial reports^[3].

That has a concrete consequence for implementation: the reporting boundary for your sustainability data should match the consolidation boundary of your accounts.

The assumptions behind your climate disclosures — and the financial assumptions in your accounts — should be consistent, so that a reader cannot find one story in the strategic report and a different one in the notes.

Building that connectivity in from the start is far cheaper than reconciling two separate sets of numbers after the fact. For how this sits within the wider rulebook, see our UK SRS requirements analysis.

Build to an assurable standard early

The FCA does not propose to mandate assurance of UK SRS disclosures in CP26/5^[2].

But the FRC has published the voluntary UK sustainability assurance standard, ISSA (UK) 5000, which is effective for engagements covering periods beginning on or after 15 December 2026^[4].

Even where assurance is optional, the discipline of building data and controls to a standard an assurer could test makes a later move to limited — and eventually reasonable — assurance far less disruptive.

For Scope 3 specifically, the proposed one-year transitional relief from 1 January 2028 is build time, not a reason to defer^[2]. See our Scope 3 reporting analysis for how to prioritise value-chain categories.

UK SRS implementation: frequently asked questions