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I'm not convinced correlation implies causation there. There's a pretty good chance that those where there's been an investment in major work to bring them up energy classes are going to be in better condition in general.
The issue I guess is that compared to other major home upgrades it just isn't that visible or beneficial in day to day usage.
aggi-
You don't have to be convinced though. The data is there. I've yet to see one of the naysayers of heat pumps actually show me data where a properly installed system isn't providing savings over a gas or oil boiler.
(That being said I have designed industrial systems whereby there won't be an OpEx saving but in these cases it's because the client has other objectives such as decarbonisation or input energy reduction as a priority).
This is the hurdle people need to get over though. Everyone wants a new kitchen or conservatory but tell me how the ROI is on these projects?
Nahguavkire
I know in Ireland the estimate is that for every 1 level increase on BER (Building Energy Rating) the property value increases by 1% so on a £500k house which increases from C3 to A3 (this is the increase I achieved with my own heat pump install at home) the value of that increase is 6% which is £30,000.
This report suggests even higher value add in UK
Agreed on the additional works being the real killer on price but I think people need to just get their head around treating it as a major home upgrade, which it is.