What do you suggest to alleviate the housing crisis? The problem is that nobody wants a new estate on their doorstep, me included. The concept that "they're concreting over the whole country", which I keep hearing, is nonsense. You only have to drive down a motorway or ride on a train to see how much unused land there is.
That there is land to be built upon is beyond doubt - even though the UK overall has a high population density compared to most European neighbours and N America.
Increasing urbanisation mainly impacts those locations already desirable - landscape, jobs, travel links, education, climate, etc. Further building directly affects current residents - ultimately too much building simply degrades the once desirable to just average. NIMBYs understandably rule.
Building where few people want to live is politically less challenging - but little point in wasting money on infrastructure and housing if there are no jobs or facilities.
Post war new towns have had a mixed experience - some close to London are now thriving having gone through difficult periods (socially and economically), and some are still failed communities with deprivation, few decent jobs, and poor infrastructure.
Levelling up - a policy now rebranded - should mean the less fortunate are supported toward the best, not the best degraded to mediocre.
No easy answers - more imaginative forward looking solutions needed which will challenge existing cultural expectations. Houses, 2-4 bedrooms, garden etc are land hungry and are the product of aspirations evolved 50-100 years ago.
Far more flexible use of retail units, offices, etc may be part of the answer.