The money would come from "people's QE" and lifting the housing revenue account cap.
Building UP, as I mentioned before, is a better way of packing more people in than creating sprawling suburbs in the green belt. For a city its size London's density has been ridiculously restrained.
>both main parties have announced impressive housebuilding targets at the last few GEs, and nobody's even come close to hitting them
Neither Blair's government nor the Tories have ever had any intention of building council housing, instead setting targets for the private sector.
>If "no Parliament can pass laws that future Parliaments cannot change", then even if under the current government councils manage to build a zillion new homes, won't the next Osbornean Tory or Blairite Labour government just give them all away again as electoral bribes
Would you prefer people didn't have homes? Just say it if that's what you want.
>My gut feeling is that the #1 problem is excessive lending on housing and way too much tolerance for housing as a speculative investment.
The financialization of housing exacerbated the problems caused by the shortage of housing, they obviously didn't create them.