the average price of a detached house in the royal borough of kensington and chelsea is now approx £4.9m In lots of other inner london boroughs it’s an affordable £1m-£1.5m in the outer london boroughs it can be as cheap as £600k (lol)
now taking all the caveats about the availability of detached houses in an area like kensington and chelsea into consideration, the horrific arguments about mean v average v median v credibility of source stats (https://www.gov.uk/search-house-prices) and, ye ken, a’ that typical internet stuff ditto, how long has this bubble got?