90% of the problems in the UK come down to the cost of housing in London (and maybe a couple of other key cities, but mainly London)

This cost is driven by relatively high wages in London, so people on good salaries can afford more, so prices go up as supply is constrained and demand increases.

The rest of the western world is starting to see this, and before London had the issue, city states in the far east like Hong Kong and Singapore had the same problem.