UK SRS S1 and S2 — Complete Standards Framework

Standards Overview

UK SRS S1 and S2 represent the foundational framework for sustainability disclosure in the UK market, published by 1 Department for Business and Trade on 25 February 2026.

These standards establish comprehensive requirements for sustainability-related financial disclosures, building on 2 IFRS S1 and S2 baseline with six UK-specific amendments reflecting domestic regulatory priorities.

Implementation follows phased approach with S2 climate disclosures proposed mandatory from January 2027 and S1 general requirements on comply-or-explain basis from January 2029.

Combined framework addresses market demand for standardized sustainability disclosure while providing proportionate implementation pathway through comprehensive implementation guidance and regulatory timeline clarity.

UK SRS S1 — General Requirements

Foundational framework establishing architectural requirements for all sustainability-related financial disclosures beyond climate topics.

S1 provides conceptual framework for materiality assessment, connectivity principles, and disclosure requirements across governance, strategy, risk management, and metrics following 4 SASB materiality guidance.

Key conceptual foundations apply immediately when implementing S2 climate disclosures as S2 cannot be applied without S1 architectural elements.

Scope Coverage

All sustainability-related risks and opportunities that could reasonably affect entity's cash flows, access to finance, and cost of capital including biodiversity, water scarcity, workforce conditions, supply chain labour, governance ethics, human rights, and any material sustainability topic using established materiality assessment frameworks.

Unlike 5 IFRS S1 baseline, UK SRS S1 does not require automatic impact materiality assessment — only where mandated by other UK regulatory requirements.

UK-Specific Amendments

Six key modifications to IFRS S1 baseline including removal of first-year transitional relief, reworked climate-first relief provisions, softened SASB requirements converting "shall" to "may", removal of mandatory GICS classification, and UK-specific effective dates replacing ISSB references through comprehensive amendment analysis.

UK SRS S2 — Climate-Related Disclosures

Enhanced TCFD framework providing comprehensive climate-related financial disclosure requirements with proposed mandatory implementation from January 2027 for listed companies.

S2 builds on existing 6 TCFD requirements while incorporating 7 GHG Protocol emissions measurement and climate scenario assessment requirements following international best practice.

Implementation supported by transitional relief for Scope 3 emissions in first year, with full value chain coverage required from 2028 through phased implementation approach.

Climate Disclosure Framework

Four-pillar approach covering governance arrangements for climate oversight, strategic integration of climate risks and opportunities, climate risk management processes and integration with enterprise risk, and climate metrics including Scope 1, 2, and 3 GHG emissions with targets and transition plans.

Framework connects with broader UK sustainability reporting landscape and aligns with FRC assurance requirements for comprehensive climate disclosure.

Scope 3 Implementation

Comprehensive value chain emissions coverage across all 8 15 GHG Protocol categories where material, with comply-or-explain relief available in 2027 transitioning to full mandatory coverage from 2028.

Implementation planning requires systematic capability development through comprehensive readiness assessment covering data systems, supplier engagement, and calculation methodologies.

Combined Implementation Approach

Phased implementation recognizes that S1 and S2 are interconnected standards requiring coordinated approach rather than standalone implementation.

S1 architectural concepts (materiality, connectivity, value chain) must be understood for effective S2 implementation, while S2 climate focus provides practical foundation for broader S1 sustainability topics in later phase.

Implementation planning should address both standards together through integrated compliance roadmap covering governance, data systems, and reporting capabilities.

Governance Integration

Board oversight arrangements must accommodate both climate-specific governance under S2 and broader sustainability governance framework under S1, with clear accountability structures and reporting lines established through comprehensive governance foundation planning.

Integration supports efficient resource allocation and avoids duplicative governance structures while ensuring appropriate subject matter expertise across climate and broader sustainability domains.

Data System Requirements

Combined data system architecture should support both climate measurement under S2 and broader sustainability metrics under S1, with particular attention to value chain connectivity and materiality assessment capabilities.

System planning includes GHG emissions measurement across all three scopes, climate scenario assessment capabilities, broader sustainability KPI tracking, and integration with financial reporting systems for effective disclosure through comprehensive capability assessment.

Regulatory Implementation Timeline

Implementation timeline subject to completion of 9 FCA regulatory process following comprehensive consultation feedback from market participants.

Key regulatory milestones include FCA Policy Statement expected autumn 2026, final rules publication, transitional guidance development, and market readiness support through industry engagement and technical guidance updates.

Preparation Timeline

Listed companies should begin comprehensive preparation programmes immediately given proposed January 2027 S2 effective date, with governance establishment requiring 6-12 month lead times and data system implementation typically requiring 12-18 months for full capability development.

Preparation priorities include board sustainability governance arrangement, emissions measurement capability building, climate scenario assessment preparation, value chain mapping and supplier engagement, and integration between sustainability and financial reporting teams through systematic implementation planning.

Market Readiness Assessment

Market preparation varies significantly across listed companies, with larger entities generally more advanced in TCFD implementation but requiring significant enhancement for full UK SRS compliance across both standards.

Common readiness gaps include Scope 3 measurement capability, climate scenario assessment sophistication, value chain mapping completeness, and integration between sustainability and financial reporting processes requiring systematic capability development.

Readiness assessment should cover both standards together through comprehensive evaluation framework identifying priority areas for development and resource allocation.

Authority Sources

1. UK SRS S1 and S2 — Complete Standards (DBT, 25 February 2026)
2. CP26/5: Sustainability Disclosures (FCA, January 2026)
3. IFRS Sustainability Standards (ISSB, 2023)
4. SASB Standards (SASB, 2023)
5. GHG Protocol Corporate Standard (GHG Protocol, 2004)