I have no idea how German suppliers have managed to inflate their prices by that much; they makes ours look like amateurs. Someone I know is currently upgrading to an air-source heat pump-powered central heating system for their old, large (1650 sq ft), detached house. New boiler, at least 10 radiators to replace, and all the rest of it - £10900. Take off the Gov grant of £7500, and it's £3400 fitted and running.
This sounds like HIP (Home Information Pack); the Government mandate that no-one bothered with, and was scrapped. https://en.wikipedia.org/wiki/Home_I...January%202012.
In view of the fact that the percentage of EVs sold fell slightly last year (16.5% from 16.6%), it looks like the public will stick two fingers up to this, and any Government trying to implement it.
Events of the last few years have shown we don't live in a democratic society; we live in a elected dictatorship, where those paid to serve us inflict their stupid rules and laws on us - whilst personally not adhering to them.