Prime Minister Tony Blair stands with his family as he leaves 10 Downing Street for the last time on June 27, 2007. Blair came to power in 1997, and won three general elections in 10 years as prime minister.
Peter Macdiarmid / Getty Images; Carl De Souza, AFP / Getty Images)
Conservative leader John Major, with his wife Norma, leaves 10 Downing Street, May, 2, 1997, to tender his resignation to the Queen at Buckingham Palace. The Labour Party swept aside the Conservatives in Britain's 1997 General Election, ending 18 years of Conservative rule.
Dave Caulkin / AP Photo
Margaret Thatcher addresses the press November 28, 1990, for the last time as prime minister, prior to handing in her resignation to Queen Elizabeth II.
Sean Dempsey, AFP / Getty Images
James Callaghan left 10 Downing Street on May 8, 1979.
Newscom
Harold Wilson exits 10 Downing Street for the last time May 5, 1976.
Landov
Edward Richard George Heath handed in his resignation on March, 4, 1974, following defeat for the Conservatives.
Keystone / Getty Images
Sir Anthony Eden heads to Buckingham Palace to hand in his resignation on January 9, 1957.
Ron Burton, Keystone / Getty Images
Clement Attlee finished his term as prime minister on October 26, 1951.
Landov
L: Winston Churchill steps into his car at the rear of 10 Downing Street on his way to hand in his resignation to King George VI, July 26, 1945, after losing to the Labour Party. R: Churchill became prime minister again in 1951, but retired in 1955. He is seen here leaving 10 Downing Street on April 5, 1955, to visit Queen Elizabeth II and tender his resignation.
Keystone, Hulton Archive / Getty Images; Topical Press Agency / Getty Images
