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UK Government consults on new sustainability reporting standards, transition planning, and sustainability assurance

Posted on 3 July 2025

In brief 

  • On 25 June 2025, the UK Government published three interconnected consultations on proposed UK Sustainability Reporting Standards, transition planning, and assurance of sustainability reporting.  
  • These mark the first step in a phased approach to revamping the UK's sustainability disclosure framework, with further consultations to follow.  
  • Future consultations will include in relation to streamlining existing reporting regimes (e.g. Streamlined Energy and Carbon Reporting, and the Energy Savings Opportunity Scheme) to remove redundant or duplicative requirements. 
  • What follows are the most important things to know about each of the current wave of consultations, which all close on 17 September 2025. 

UK Sustainability Reporting Standards (UK SRS) 

Exposure drafts of new reporting standards (UK SRS S1 and UK SRS S2) follow the equivalent global standards (IFRS S1 and IFRS S2) published by the ISSB in 2023. These respectively set out general requirements for sustainability-related financial disclosures, and more specific requirements in relation to disclosure of climate-related risks and opportunities. 

The consultation does not address which companies will be required to adopt the new standards, nor when they will need to start reporting in line with them. Rather, it primarily deals with six proposed amendments to the ISSB standards, deemed necessary for the UK to be able to endorse them: 

Amendment 1: removal of the transition relief in IFRS S1 that permits delayed reporting in the first year 

IFRS S1 includes a transition relief that allows reporting entities to publish sustainability-related disclosures later than their financial statements in the first year of applying ISSB standards, to provide more preparation time. 

This relief has been removed from UK SRS S1 on the grounds that it would undermine the principle of connectivity between financial and sustainability reporting. Additionally, it's considered that UK entities should be well placed to report simultaneously, given that existing UK rules have required large and listed companies or groups to make TCFD-aligned disclosures since 2022. 

Amendment 2: extension of the transition relief in IFRS S1 that permits a 'climate-first' approach 

IFRS S1 includes a transition relief that permits entities to report on climate-related matters only in their first year of applying ISSB standards. Disclosure of sustainability-related risks and opportunities beyond those associated with climate change may be deferred by a year. 

In the proposed UK SRS, this relief has been extended to two years. Alongside the one-year relief on disclosing Scope 3 greenhouse gas emissions (maintained from IFRS S2), this means that reporting entities have the option to phase in implementation, with minimum disclosure requirements as follows: 

  • Year one: climate-related risks and opportunities, excluding Scope 3 emissions 
  • Year two: climate-related risks and opportunities, including Scope 3 emissions 
  • Year three: climate-related risks and opportunities, including Scope 3 emissions, plus wider sustainability-related risks and opportunities. 
Amendment 3: removal of the requirement to use the Global Industry Classification Standard (GICS) in IFRS S2 

IFRS S2 includes requirements on financed emissions, i.e. greenhouse gas emissions associated with financial institutions' lending and investment activities. One of these is the use of the Global Industry Classification Standard (GICS) six-digit industry code. In the draft UK SRS S2, this requirement is removed, providing companies with the flexibility to use GICS or an appropriate alternative classification standard.  

Amendment 4: removal of the "effective date" clauses in IFRS S1 and IFRS S2 

Both ISSB standards currently include a statement on their effective date: "An entity shall apply this Standard for annual reporting periods beginning on or after 1 January 2024. Earlier application is permitted." 

These clauses are removed from the draft UK SRS, on the basis that the standards will be freely available for any entity to use on a voluntary basis at a time of their choosing. As for entities that may be required to use UK SRS, a clarifying sentence is added to explain that the timetable for applying the standards is dependent on relevant legislation or regulation put in place by the Government or the Financial Conduct Authority (FCA). 

Amendment 5: references to the SASB materials in IFRS S1 and IFRS S2 

IFRS S1 and IFRS S2 include requirements that state that entities "shall refer to and consider the applicability of" the standards published by the Sustainability Accounting Standards Board (SASB) and the "Industry-based Guidance on Implementing IFRS S2" (which is based on the SASB Standards). 

In the draft UK SRS, it is proposed to amend "shall refer to and consider" to "may refer to and consider", making it clear that, while entities can refer to SASB materials if they wish, they are not required to do so. 

Amendment 6: treatment of transition reliefs 

Both IFRS S1 and IFRS S2 include transition reliefs (e.g. see Amendment 2 above), which organisations are permitted to use from the first annual reporting period in which they apply the standards. 

For voluntary users of UK SRS, the Government believes it's a business choice to report against some or all of the standards, and that it would be inappropriate to define how and when certain requirements within the standards apply. 

Accordingly, it proposes to amend ISSB wording such that transition reliefs are explicitly linked to the introduction of any mandatory reporting requirements. As a result, entities that do not fall within the scope of any future reporting obligations, would not be bound by any restriction on applying transition reliefs. 

A full list of consultation questions can be found at Annex 1 of the exposure draft of the UK SRS. In addition to feedback on the proposed amendments to ISSB standards above, the Government is also keen to hear views on expected additional costs and benefits of using the UK SRS, versus current reporting practices, and where additional guidance may be helpful when reporting information against them. This will help inform the next phase of work on implementation. 

Transition planning 

In its manifesto, the Government committed to mandating "UK-regulated financial institutions (including banks, asset managers, pension funds and insurers) and FTSE100 companies to develop and implement credible transition plans that align with the 1.5°C goal of the Paris Agreement". 

However, while UK SRS do require disclosure of a proportion of the information that would feature in a transition plan, they stop short of mandating that an entity has one. Alongside its consultation on UK SRS, the Government is also seeking views on further steps that could be taken to increase disclosure of transition plan information, proffering two alternative routes: 

Option 1: require entities to explain why they have not disclosed a transition plan or transition plan-related information 

Under this option, the Government would not require companies to produce distinct transition plans, separate from annual reporting, but entities would be free to do so on a voluntary basis. Those that haven't published a plan, or that haven't disclosed transition plan-related information in accordance with UK SRS S2, would be compelled to explain why that is the case. 

Option 2: require entities to develop and disclose transition plans 

Under this option, the Government would require entities to develop a transition plan and disclose transition plan-related information as part of its annual reporting. It could also require entities to publish a separate transition plan document, in line with Transition Plan Taskforce (TPT) recommendations that entities should publish a standalone transition plan document at least every three years. Such an approach would enable companies to provide greater detail versus what might be possible within annual reporting.  

Recognising the potential additional burden of option 2, the Government seeks stakeholder views on the advantages and disadvantages of mandating entities to publish a standalone transition plan document, including whether the benefits of doing so outweigh the risk of duplication alongside annual reporting. 

Sustainability assurance 

The third related consultation focuses on the provision of assurance over sustainability-related financial disclosures. Following publication of a Financial Reporting Council (FRC) study earlier this year, which highlighted concerns over the quality and consistency of sustainability assurance, the Government is seeking views on the proposal to create a registration regime for those who offer assurance services for sustainability reporting. The main features of that proposal are: 

Creation of a new category of "sustainability assurance provider" 

Recognising the broad range of skills needed to provide effective assurance of sustainability-related financial disclosures, the Government would create a new category of provider. Being profession-agnostic, this new category would allow both audit and non-audit professionals to register as sustainability assurance providers. 

Oversight by ARGA 

Sustainability assurance providers would be overseen by the Audit, Reporting and Governance Authority (ARGA). ARGA would be responsible for registering providers, setting the eligibility criteria for registration, monitoring their performance, and where necessary, taking proportionate enforcement action when they perform poorly. 

Registration on a voluntary basis 

The Government anticipates the proposed registration regime operating on a voluntary basis in the first instance. This is on the assumption that reporting entities are more likely to seek the services of registered providers than unregistered ones, and that it is therefore in providers' self-interest to opt in to the regime. 

However, the Government will also consider the need to mandate the assurance of company disclosures against UK SRS, in which case, registration with ARGA could become a precondition to providing sustainability assurance services. 

 

How can we help? 

These consultations are happening at a difficult time. As illustrated by EU omnibus proposals, seemingly unstoppable momentum behind enhanced sustainability, due diligence and disclosure regulations has been stalled by political headwinds, adding uncertainty to an already complex and fragmented landscape. 

Particularly for larger, listed and multinational organisations, there is a growing need for trusted advice to help identify what obligations apply now, to anticipate what may lie ahead, and to put in place the policies, practices, and systems necessary to meet compliance obligations. At the same time, there is also a need to see beyond regulatory compliance and embrace the best practices necessary to preserve future resilience and competitiveness in an era defined by escalating systemic risks. 

This is why Mishcon Purpose has been built as an interdisciplinary practice, uniting expert lawyers and sustainability professionals. By balancing compliance with strategic foresight, we not only help clients to mitigate risk, but also to seize opportunities to lead and benefit from sustainable transition. 

To discuss your biggest sustainability challenges and ways we can help, get in touch to arrange a free 30-minute consultation. 

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