Yes. UK SECR requires large companies to report Scope 1 and Scope 2 emissions and an intensity metric. Fuel savings from insulation directly reduce your reported Scope 1 figure and improve your intensity ratio. Document the project with before/after energy meter readings or an ESOS-compliant thermal survey.
From our guide: How Insulation Reduces Scope 1 Emissions — full context, charts and sources there.
