- Parliamentary Labour Party
Commentators on the British Constitution sometimes draw a distinction between the Labour Party (which was created outside Parliament and later achieved office) and the Conservative and Liberal parties (which began as parliamentary factions). The term 'Parliamentary Labour Party' properly refers to the party in parliament, whereas the term Labour Party refers to the entire Labour Party, the parliamentary faction of which is the PLP.
Originally, the Leader of the Labour Party was elected by the PLP. Nowadays, an electoral college is used, consisting of three sections – MPs and MEPs, affiliated organizations (trade unions and socialist societies), and Constituency Labour Parties (CLPs). A person can be counted in multiple categories, so, for example, an MP who belongs to a trade union, one socialist society, and a CLP gives four votes (although the vote he gives for being an MP is by far the most influential one). The single transferable vote is used to conduct the election.
Labour MPs retain the power to trigger an extraordinary or "special" Labour Party Conference to choose a new leader if they lose confidence in their existing leader.
Labour MPs also elect two of their number to Labour's National Executive Committee.
The PLP holds regular meetings behind closed doors to question the Leader and to discuss its concerns.
Chairman of the Parliamentary Labour Party
The Chairman of the PLP chairs meetings of the Parliamentary party. He or she is elected by Labour MPs at the start of each annual session of Parliament. By tradition, only elections at the start of each Parliament, following a general election, are competitive.
From 1921 to 1970, the Chairman of the PLP was also the leader of the party as a whole (before 1921, leadership of the party was arguably split between the Chairman of the PLP, the General Secretary and the Party Chairman). When the leaders of the Labour Party joined coalition governments during the First and Second World Wars, an acting chairman was appointed to lead the rump of the party in Opposition. When the Party was in government, a liaison committee was elected to facilitate communications between the cabinet and Labour backbenchers - the chairman of this committee also chaired meetings of the PLP as a whole during these periods. In 1970, the positions of Leader of the Labour Party and Chairman of the PLP were permanently split.
- Keir Hardie (1906–08)
- Arthur Henderson (1908–10)
- George Barnes (1910–11)
- Ramsay Macdonald (1911–14)
- Arthur Henderson (1914–17)
- John Hodge (1915–16) - in Opposition
- George Wardle (1916–17) - in Opposition
- William Adamson (1917–21)
- J. R. Clynes (1921–22)
- Ramsay Macdonald (1922–31)
- Arthur Henderson (1931)
- George Lansbury (1931–35)
- Clement Attlee (1935–55)
- Hugh Gaitskell (1955–63)
- Harold Wilson (1963–70)
- Douglas Houghton (1970–74)
- Ian Mikardo (1974)
- Cledwyn Hughes (1974–79)
- Fred Willey (1979–81)
- Jack Dormand (1981–87)
- Stanley Orme (1987–92)
- Doug Hoyle (1992–97)
- Clive Soley (1997–01)
- Jean Corston (2001–05)
- Ann Clwyd (2005–06)
- Tony Lloyd (2006–)
- ^ http://www.britishonlinearchives.co.uk/collection.php?cid=9781851171330&sid=&keywords=
- ^ This would require 20% of the PLP to nominate a named member of the PLP prior to the annual party conference. 
Labour Party LeadershipLeadersPLP Chairs Internal electionsLeadership electionsDeputy Leadership electionsShadow Cabinet elections
1979 (Callaghan) · 1980 (Foot) · 1981 (Foot) · ... · 1992 (Smith) · 1993 (Smith) · 1994 (Blair) · 1995 (Blair) · 1996 (Blair) ·2010 (Miliband)
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- = wartime, in opposition
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