and several demolished houses in Charles Street. It is a post-modern building dating from c.2000 which defers to the Georgian style of the street. It was built to be Ericsson's London office and was sold to BP for £117 million in 2001. No. 3: The original house had many owners and tenants, including the holders of at least three separate dukedoms, and was worked on by various architects including John Soane. General Augustus Pitt-Rivers lived in the house as a child during the 1830s and 1840s. The present building is a 1930s office block. No. 4: The Naval and Military Club in a Georgian house of 1726–28 by Edward Shepherd. Former home of Nancy Astor and the only house in the square to retain its large garden and the original mews house to the rear. No. 5: Wentworth House, 5, St James's Square, built in 1748-51 by William Wentworth, 2nd Earl of Strafford, to the design of Matthew Brettingham The Elder 1748–9. Refronted in stone, porch added, and attic converted into a full storey in 1854. Now offices; In 1984 it was the Libyan "People's Bureau", when during the Libyan Embassy Siege gunshots fired from the building caused the Murder of Yvonne Fletcher. No. 6: (Under Demolition) Rio Tinto Group head office. Modern. This building was the home of the Hervey family (Earls and Marquesses of Bristol) for nearly 300 years. Lord Arthur Hervey was born at the house in 1808. In the 1950s the old building was knocked down, and the family did not return. No. 7: Neo Georgian, architect Edwin Lutyens, 1911. No. 8: Neo Georgian, architects Robert Angell and Curtis, 1939. In November 2007, No. 8 and neighbouring No. 7 were bought for £125m. Nos. 9 to 11: Numbers 9, 10 and 11 were built in the 1730s on the site of the former Ormonde House, once the largest house in the square. Henry Flitcroft supervised number 10 and probably also numbers 9 and 11. No. 10 is Chatham House, former home of British Prime Minister William Pitt the Elder and of the Earl and Countess of Blessington. There is a London County Council plaque on Number 10 stating "Here lived Three Prime Ministers WILLIAM PITT Earl of Chatham 1708–1778 Edward Geoffrey Stanley EARL OF DERBY 1799–1869 William Ewart GLADSTONE 1809–1898". No. 12: Built 1836, probably by Thomas Cubitt. Former home of Augusta Lovelace. No. 13: Built