Clarence House stands next to St James's Palace and was built between 1825 and 1827 to the designs of John Nash for Prince William Henry, Duke of Clarence.  He lived there as King William IV from 1830 until 1837.  During the second world war, the War Organisation of the British Red Cross and Order of St. John of Jerusalem for the duration of the war. Two hundred staff of the Foreign Relations Department maintained contact from Clarence House with British prisoners-of-war abroad, and administered the Red Cross Postal Message Scheme.  In 1949 Clarence House was returned to Royal use, when it became the London home of Princess Elizabeth, elder daughter of George VI, following her marriage to Lieutenant Philip Mountbatten on 20 November 1947. The couple could not move in straight away since the building needed complete refurbishment. Wartime restrictions on building work made progress slow. The Duke and Duchess of Edinburgh, as they were then known, moved to their new home in June 1949.

It was the London home of Queen Elizabeth The Queen Mother from 1953 until 2002.  A story goes that she once (probably often) rang down to the butlers after getting no response from her bell pull and said in a very camp way: “I don't know what you old queens are doing down there but this old queen up here is dying for a glass of gin.” For a time Princess Margaret lived there too.  After the death of the Queen Mother, Clarence House became the official London residence of The Prince of Wales and The Duchess of Cornwall. It is open to the public during the summer months each year.