Cambridge House, Piccadilly, London, England= Cambridge House is a grade I listed mansion on the northern side of Piccadilly (Number 94) in central London, England, named after one of its owners, the Duke of Cambridge, 7th son of George III. It has also been known as Egremont House, Cholmondeley House, The Naval and Military Club, and the In and Out Club.===History===The house was built for Cha...