The UK Finalized Its Climate Reporting Standards. Here Is the Part That Reaches Suppliers Outside the UK.
The United Kingdom Department for Business and Trade published the final UK Sustainability Reporting Standards, UK SRS S1 and UK SRS S2. They are the UK's adoption of the ISSB's IFRS S1 and S2, and they are available today for voluntary use by any entity. The Financial Conduct Authority has also proposed the rules that would make them mandatory. That proposal, CP26/5, opened in January 2026 and a final policy statement is expected this autumn.
If you manufacture ingredients in New Jersey, South Carolina, or anywhere outside the UK for that matter, the natural reaction is the one we hear every time a new jurisdiction lands: this is a UK problem. In the narrow legal sense, that is right. UK SRS creates no filing obligation for a US supplier. But this is the same as the ISSB becoming the global baseline, or California SB 253, or the EU's standard for non-EU groups. Being outside a reporting requirement is not the same as being outside its reach.
In this case the reach has a date attached to it, and the date is closer than most probably realize.
The UK adopted the global standard, then edited it in both directions
The UK has backed the ISSB approach since COP26 in Glasgow, treating the international standards as the right baseline while reserving the right to adjust them for the UK context. UK SRS S1 and S2 are, in the vast majority of their content, identical to IFRS S1 and S2. What separates them is a small number of targeted amendments, each recommended by the UK's Technical Advisory Committee or Policy and Implementation Committee that were confirmed through a consultation that drew more than 200 responses. The ISSB's own December 2025 amendments were folded into the final UK text as well.
The detail worth pausing on is that those amendments cut both ways. Some make UK SRS more flexible than the global standard. Reference to SASB industry guidance moved from mandatory to discretionary, which lightens the load for smaller entities and for sectors where SASB coverage is thin. Financial institutions gained a mechanism to explain rather than simply fail on financed emissions where full compliance is genuinely impracticable, provided they set out a plan and a timeline.
Others make it stricter. The UK removed the year-one timing relief that IFRS S1 permits, so sustainability disclosures have to be published at the same time as the financial statements from the very first year of application. And a company using the climate-first relief cannot claim full UK SRS S1 compliance while it does so, even though it can still claim UK SRS S2 compliance. Taken together, a UK reporter has less room to phase its first year than an ISSB reporter elsewhere does.
For a supplier, the practical translation of that second group of changes is simple. Your customer's sustainability data now has to be finished when its financial statements are finished. There is no longer a few months of slack at the end for chasing missing supplier numbers.
Two different groups are in scope, and only one of them is new
It is easy to conflate two separate populations here, and conflating them leads suppliers to underestimate how much of this is already live.
The first group is companies already covered by the UK's existing climate disclosure regime under the Companies Act, broadly public interest entities with 500 or more employees and large companies or LLPs with turnover above £500 million and 500 or more employees. These companies have a mandatory TCFD-aligned disclosure obligation today, not in 2027. The government has confirmed that UK SRS S2 qualifies as a national reporting framework under the Companies Act, so adopting it satisfies that existing obligation. For listed companies, UK SRS S2 replaces the current TCFD-aligned requirements rather than stacking on top of them.
The second group is the new Financial Conduct Authority (FCA) mandate, which is narrower. It proposes to apply to roughly 515 companies on the Main Market of the London Stock Exchange. Alternative Investment Market (AIM)-listed companies sit outside the proposed mandatory scope, though they can adopt voluntarily, and large private companies are not yet in scope either, pending a consultation under the government's Modernizing Corporate Reporting program.
Two features of that FCA perimeter matter for those outside the UK. It is drawn by listing category rather than by where a company is incorporated, which means roughly 90 of the 515 are incorporated somewhere other than Britain. And companies with UK secondary listings or depositary receipt programs get a lighter transparency regime instead, where they describe what they report against in their home jurisdiction and point stakeholders to it. For a US-primary-listed company, that often amounts to disclosing that no federal mandate exists.
For the cosmetics and personal care supply chain, the combined perimeter captures a meaningful set of buyers. Unilever, Reckitt, Haleon, PZ Cussons and Croda are all London-listed, and several of them are on your customer list.
The phasing tells you when the questions arrive
The FCA's proposed sequence is worth planning around directly, because each step generates a different kind of request.
From January 1, 2027, UK SRS S2 climate disclosures become mandatory, with transition plan disclosure on a comply-or-explain basis. From January 1, 2028, Scope 3 greenhouse gas emissions follow, also comply-or-explain. From January 1, 2029, the broader UK SRS S1 sustainability disclosures arrive. All of it is subject to confirmation in the autumn policy statement, but the direction and sequence are settled.
The Scope 3 step in 2028 is the one that lands on suppliers, and for a consumer goods company Category 1, purchased goods and services, is almost always the largest line in the inventory. That category is your product sitting inside your customer's disclosure. A brand cannot build a defensible Category 1 figure from spend-based estimates indefinitely, because spend-based data tells a stakeholder what the company bought rather than what it emitted, and it does not move when a supplier actually decarbonizes. The only way to improve the number is supplier-specific data.
The 2027 step matters too, and it arrives first. A transition plan is a statement about how a company intends to decarbonize, and for a brand whose footprint is dominated by purchased goods, that plan is mostly a statement about its suppliers. Writing one credibly requires knowing which suppliers have inventories, which have targets, and which can produce product-level figures.
Comply-or-explain is not the relief it sounds like
It is tempting to read comply-or-explain as an escape hatch that keeps all of this theoretical. The drafting does not support that reading, and neither does the commercial logic.
An explanation has to be specific. It has to identify which of the fifteen GHG Protocol categories were assessed and why particular ones cannot be disclosed, describe concrete steps being taken to remove the constraint, set out a realistic timeline, and explain how the board is overseeing the gap. Among the constraints companies are expected to name is the one that matters most here: suppliers unable or unwilling to provide primary emissions data.
Sit with what that means. A company that cannot report Scope 3 has to tell its stakeholders, in its annual financial report, that the reason sits in its supply chain, and then describe its plan to fix it. Procurement teams do not enjoy being the constraint a CFO has to explain to the market, and the plan to remove that constraint tends to look like formal data expectations written into supply agreements and a preference for suppliers who already have the numbers.
Comply-or-explain does not reduce the pressure on suppliers. It moves it out of a regulatory deadline and into a commercial conversation, which is generally where it arrives faster and with less notice.
Assurance is the quiet part of this
The FCA has not proposed mandatory assurance for the first reporting year, so it is easy to set aside. That would be a mistake. The Financial Reporting Council's ISSA (UK) 5000, the UK version of the international sustainability assurance standard, applies on a voluntary basis to sustainability information reported for periods beginning on or after December 15, 2026, and stakeholder pressure to obtain assurance voluntarily is likely to be significant well before any mandate exists.
The groundwork assurance requires is documented internal controls, recorded data sources and judgements, and formal board sign-off. When a customer builds that discipline into its own reporting, the discipline propagates outward. A number that has to survive an assurance provider's review cannot rest on a supplier estimate emailed without a methodology attached. Expect the requests you receive to start asking not just for a figure but for the boundary, the emission factors, the data quality, and the basis of any allocation.
This is the difference between having a number and having a defensible one, and it is where most mid-market suppliers are currently exposed.
The same data, asked a fifth way
There is a genuinely encouraging part of this, and it is the same encouragement running through everything the ISSB has enabled. Because UK SRS is built on IFRS S1 and S2 rather than on a bespoke British framework, a supplier that already has an ISSB-shaped answer does not need a new one. The UK made a handful of amendments, not a different request.
That means the work compounds. A defensible GHG inventory built on the GHG Protocol answers a UK SRS request, a California SB 253 request, a CDP questionnaire, an EcoVadis carbon module and a customer's ESRS data call. Product-level LCAs give your customer the supplier-specific Category 1 data that spend-based estimates cannot produce, in a form that works regardless of which regulator is standing behind the request. The suppliers who struggle are not the ones facing too many frameworks. They are the ones rebuilding from scratch every time a new one arrives.
Build for 2028, not for the request
The UK ran a two-year endorsement process and came out of it with amendments to timing, to phasing, and to how industry guidance is referenced. None of them changed what a company has to measure. The disclosure architecture is still governance, strategy, risk management, metrics and targets, and the emissions requirement is still the GHG Protocol across all fifteen Scope 3 categories.
That is the useful signal. Jurisdictions are diverging on the legal instruments and converging on the underlying data, and the data they are converging on is the data that sits with suppliers.
You will not file under UK SRS. Your customers will, and the first time most of them have to give a real answer on Scope 3 is a reporting period beginning less than eighteen months from now, preceded by a transition plan they have to write before that. The suppliers who handle it comfortably are the ones who already have a GHG inventory and product-level LCAs in place, documented well enough to withstand someone else's auditor, not the ones who start assembling them the week the questionnaire arrives.
How ADB Sustainability can help
ADB Sustainability works with mid-market companies to turn downstream compliance pressure into a manageable, repeatable process. We build Greenhouse Gas Protocol-aligned GHG inventories, develop product-level life cycle assessments (LCAs), prepare and manage EcoVadis and CDP submissions, and broader ESG and sustainability reporting. If your customers have started asking for data, or you expect them to soon, we can help you answer with confidence.
To talk through where your reporting stands and what your customers are likely to request, get in touch with ADB Sustainability.