Prime Central London property values have fallen 23% in real terms since their 2015 peak, according to fresh market analysis, marking one of the most sustained downturns in the segment's modern history. For a market long regarded as a global safe haven for capital — impervious to Brexit votes, pandemics and rate cycles alike — this is not a blip. It is a decade-long correction that has quietly reshaped the economics of London's most exclusive postcodes, from Belgravia and Chelsea to Mayfair and Knightsbridge.