As a CPA child, you should understand that the same money is very different when it comes out of a different account.
(everyone watches two critical numbers, income tax and government deficit, so the #1 priority is to hide capital spending somewhere else, in this case by moving it to buyers of new homes)
They might not have much of an impact on property values (certainly no more than the plethora of existing building regulations). But we shouldn't be surprised if as a result people vote for a candidate whose campaign promise consists of picking up a grenade launcher and blowing up windmills.
Even moreso now, because PV is now cheaper per square metre than tiles or fences, even if you don't hook it up to the grid afterwards.
On the other hand, this is the UK so maybe. They did Brexit and somehow Farage hasn't been deported for the consequences.