Cutting Scope 3s: the major hurdle in achieving UK sustainability

Scope 3 emissions - those generated across the supply chain - can account for up to 90% of a company's total carbon footprint. Addressing them demands more than better technology: it requires actively bringing suppliers on the sustainability journey with you.

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1.Why scope 3 emissions remain the hardest challenge for UK businesses

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For most UK businesses, Scope 1 and 2 emissions are increasingly well-managed. Scope 3 emissions, however, are proving the more challenging frontier to navigate. Covering everything from procured goods and logistics to capital equipment across the value chain, Scope 3 reductions sit largely outside a company's direct control but in many sectors account for around 80–90% of its total carbon footprint. The challenge is not just measuring Scope 3 data, but influence and engagement with third party suppliers.

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Scope 3s are divided into “upstream” emissions (pre production of goods/services sold) and “downstream” emissions (post production). The sub-categories (or “emission post”) of Scope 3s include: energy related emissions (not included in posts 1-7); waste generated; business travel;  upstream/downstream transport and distribution; and employee trips from work home. In other words, all indirect emissions which can be far more challenging to define given the complexity of global supply chains for UK firms today.

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2.Regulations Governing Scope 3 Reporting

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There are a number of legislative frameworks governing the reporting of emissions in the UK. These include:

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‍2.1 UK Environment Act 2021 

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Landmark legislation enshrined binding targets including achieving Net Zero by 2050, focusing on delivering defined improvements to air quality, biodiversity, water, and waste across the UK. 

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2.2 UK Sustainability Reporting Standards (SRS) 

Released by the Department of Business and Trade on 26 February 2026, UK SRS establishes a coherent, globally aligned framework for disclosing sustainability-related financial information, replacing the TCFD framework, SECR, and other architecture. UK SRS S1 delineates General Sustainability Disclosures while SRS S2 outlines the Climate Related Disclosures including new requirements for Scope 3 reporting. S2 incorporates core TCFD pillars of Governance, Strategy, Risk Management, and Metrics and Targets (incl. reporting Scope 1, 2 and 3 GHGs) but places increased disclosure requirements on UK firms.

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Currently, Scope 3 emissions reporting is entirely optional under the new SRS, but firms must disclose they are opting out. The FCA is expected to finalise its rules for mandatory reporting this Autumn, however mandatory S2 (climate) reporting for listed companies under the new UK Listing Rules is expected to commence in January 2027 with Scope 3 GHGs to be reported on a 'comply-or-explain' basis, with just a one-year transitional period. UK companies therefore need to get up to speed with these regulations as they fast approach mandatory status. 

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3. The UK Companies Leading the Way on Scope 3 Reductions 

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In the UK, in particular larger corporations, are leading the way on decarbonising end-to-end supply chains and engaging in responsible procurement by embedding carbon criteria into tender processes and supplier contracts. This not only ramps up green competitiveness, reduces costs but encourages often smaller firms down the supply chain to put decarbonisation at the forefront of all business decisions. Speaking at edie 26, Greg Ritt, Group Head of Sustainability at Stagecoach, outlined how it achieved an impressive 10% reduction in Scope 3s in 2025, part of its target to cut absolute indirect emissions by 54.6% by 2032.

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3.1 Upskilling suppliers through structured training

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The engine of this progress was structured supplier engagement. Stagecoach enrolled almost 100 of its partners in the UN Global Compact (UNGC) Network UK Sustainable Suppliers Training Programme 2025, providing focused training on corporate sustainability, amplifying knowledge of the UN's Ten Principles, and global frameworks such as the Sustainable Development Goals (SDG). Rather than demanding compliance, the bus company invested in equipping partners with the knowledge to embed sustainability as a core business practice.

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3.2 Identifying barriers and creating commercial incentives

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The training also identified other key insights: the SDGs Stagecoach's suppliers were most aligned with (innovation, employee wellbeing, and economic growth), and the main barriers - lack of financial resources and specialist knowledge. Stagecoach reinforced this engagement on sustainability commercially, offering longer-term contracts to suppliers that demonstrated a genuine commitment to ESG, providing a clear business case to invest in change. Other UK corporates including NHS England and Tesco have also engaged directly with suppliers on their Net Zero policies in order to bring alignment and provide decarbonisation support. 

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4. How Sami’s carbon solution slashes Scope 3 GHGs

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Another vital way of reducing your company’s Scope 3 emissions is using an optimal software platform to collect and accurately calculate emissions, helping turn often complex Scope 3 data into actionable insights. Sami offers a complete carbon software solution that maps out all emissions including indirect emissions by automating the data collection, mapping, and analysing processes across a company's value chain. Our tailored tool aligns with international methodologies like the GHG Protocol and Bilan Carbone® to categorise and measure indirect emissions. Sami’s solution also provides users with other intelligent tools like customised supplier questionnaires, a decarbonisation action plan and progress tracker. By leveraging these tools, companies can convert multilayered supply chain data into actionable insights for reducing their overall carbon footprint.  

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4.1 Technology and human partnership working together

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But sustainability tools work best when suppliers are already engaged and motivated to share accurate data. UK companies that invest in both - building supplier capability while deploying smart reporting tools - will move fastest and furthest on Scope 3. Supplier emissions tracking, activity-based carbon accounting and sustainable sourcing are among some of the innovative solutions proving gamechangers across UK Limited's ESG reporting landscape.

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5. The Net Zero Supply Chain: Treating Suppliers as Partners

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Achieving a net zero supply chain is no longer just a carbon liability to be managed at arm's length. For UK businesses serious about achieving net zero, it is the next frontier - and the companies that treat their suppliers as partners, not just data sources, will be the ones that lead in the race to cleaner, greener supply chains.