1945: Winston Churchill (Conservative)
1951: Clement Attlee (Labour)
1959: Hugh Gaitskell (Labour)
1964: Alec Douglas-Home (C-Liberal Democratic Coalition)[1]
1966: Harold Wilson (Labour)
1970: Harold Wilson (Labour)
1975: Margaret Thatcher (Conservative)
1979: Anthony Benn (Labour)
1989: Neil Kinnock (Labour)
1995: John Major (C)
1999: Gordon Brown (Labour) [2]
2004: John Kennedy (LD-C Coalition, Later Liberal Conservative party)[3]
2009: John Kennedy (Liberal Conservative)
2014: Andy Burnham (Labour)
[1] The first coalition scince 1935. Even with the coalition the Conservatives are short of a majority by three seats.
[2] While Labour led by Gordon Brown came out as the largest party after the 1999 election which led to a hung parliament, the biggest news was that the Liberal Democrats managed to displace the Conservatives as the second largest party, and Paddy Ashdown became leader of the opposition.
[3] The miracle on Downing Street. The first Liberal Democrat Prime Minister ever. Thanks to a coalition with the Conservatives. Later both parties join to form the Liberal Conservative Party.