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Hi Ian,
Innovate UK was involved in some work in this field a few years ago. This included the £8m Building Performance Evaluation programme (BPE) and the £26m Retrofit for the Future programme.
There were some data sets for these but i’m not certain what happened to them
https://www.ukri.org/publications/non-domestic-buildings-best-practice-and-what-to-avoid/
As for SME’s i’d recommend that you speak to, try Unifi.id and Demand Logic (they both may be on here).