Nonesense. I just checked on rightmove for a three bed in Wallingford (a tiny town in central England a km across that consists entirely of suburbs and is an hour's drive from the edge of London). It's about 30% smaller than the average US residence while costing just under a million dollars.
Heck, Ramsey is in the middle of bloody nowhere and its still >$400k for a three bed half the size of what you can get inside Chicago city for the same price.
Brits struggle to comprehend just how much worse off we are than the Americans. Similar housing (similar type of location etc) costs 3x-6x as much despite Brits earning less.