Whilst I fully support diminishing gas as a heating source, it was never going to work.
Houses in Britain are too inefficient for heat pumps. We needed to have listened to Insulate Britain, and that's what Labour should be focusing on instead of forcing heat pumps.
This was something the Lib Dems focussed on during the 2010 coalition. Many older houses had loft insulation installed for free, greatly increasing efficiency. I wish more people voted Lib Dems.
That's not how this works. Even without decent insulation, a heat pump is still the most efficient way to warm a home. I have shit insulation in my house; the heat pump is my only source of warmth and it does a damn fine job.
My understanding is that heat pumps are too slow for old Victorian houses for them to be more efficient than gas boilers (which are pretty fast comparatively). I'm glad your heat pump was viable though!
There are much better 10 year targets to have. Too many 10 year targets dilutes them all and soon people don't pay attention and so you fail them all.
As such I agree - everything I know about the UK (I'm an American who has never been there so not much!) says their insulation levels are world leading pathetic. Fixing insulation would make a much larger difference than just about anything they could do as such I would (again as an outsider who doesn't know UKs problems) place insulation as what should be a top priority because of how much larger the impact it would have. A 60% boiler (something 50 years old) in a well insulated house would use similar energy to a heat pump in an uninsulated house (there are so many variables in that statement that you cannot actually find any comparison to verify it)