Ken Griffin’s London purchase becomes most expensive home sold in the UK since 2011A billionaire US hedge fund manager has bought a Grade II*-listed Georgian mansion within sight of Buckingham Palace for almost £100m.Ken Griffin, the 152nd richest person in the world with an estimated $8.8bn (£6.8bn) fortune, purchased 3 Carlton Gardens, which overlooks the Mall and St James’s Park, for £95m. While it is the most expensive home sold in the UK since 2011, it changed hands at a £50m discount from the £145m it was marketed at in the Financial Times’ How to Spend It magazine last October.