Good luck trying to mass build in this financial and fiscal environment. Governments could cut as much red tape as they'd like now to stimulate housebuilding and the market will still continue to build higher priced homes because that's the only game in town now to deliver an attractive ROI.

A fundamental issue no one is truly engaging with his the concentration of where people want to live which has been a combination of where jobs are and the development consumer activities in those locations have fostered to keep them attractive places to live. They're too many people trying to live in too few places and thats subtly due to necessity related to where employment is.

Remote working should have eased that more sustainably over the medium term but society decided it was better to throw the baby out with the bathwater when it came to that & productivity issues etc.