Good morning Community!
As sustainable investors, we often talk about the importance of clear policy frameworks and robust appraisal methods and two recent developments offer exactly that.
First, the UK Government has reaffirmed its commitment to embedding environmental principles across policymaking. In a 2020 Written Question, Ministers confirmed that environmental principles will be formally integrated into government guidance, including HM Treasury's Green Book, ensuring they shape decision-making across departments.
Second, the 2026 edition of the Green Book the UK's central guidance for assessing the value, costs, risks and wider impacts of public investment has now been updated and streamlined. It strengthens the framework for long‑term, sustainability‑aligned public spending, with clearer guidance on social, environmental and climate‑related costs and benefits.
For our community, these updates matter. They reinforce that the UK's policy architecture continues to shift toward long-term value, environmental accountability, and transparent, place‑based economic outcomes all critical foundations for sustainable investment.
• Environmental principles now embedded in core policymaking guidance
Government departments must apply environmental principles consistently, strengthening alignment between policy, stewardship expectations, and real‑economy outcomes.
• The 2026 Green Book reinforces rigorous appraisal of climate and environmental impacts
It provides updated guidance on valuation of social, environmental, and climate impacts-an essential tool for assessing sustainability‑aligned investments.
• More coherent, holistic investment decisions
With environmental principles and updated appraisal methods integrated, public investment decisions will increasingly consider long‑term resilience, transformational potential and sustainability.
How do these updates influence the way you approach long‑term sustainable investment decisions?
The Green Book Attached
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Aya Pariy
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