Prime Ministers of the United Kingdom (1918-1926)
1918-1923: Austen Chamberlain (Conservative Party)
1918: H.H. Asquith (Liberal Party), Eamon de Valera (Sinn Fein), Robert Blatchford (Democratic Labour Party), William Adamson (Labour Party), David Lloyd George (Independent Liberal Party), Thomas Hargrave Bell (Independent Labour Party), Henry Page Croft (National Party), Horatio Bottomley (John Bull Party)
1923-1925: Robert Blatchford/Henry Page Croft (National Democratic Party)
1923: Austen Chamberlain (Conservative Party), Philip Snowden (Independent Labour Party), H. H. Asquith (Liberal Party), Noel Pemberton-Billing (National Vigilance Party), Joseph Devlin (Independent Nationalist Party)
1925-1926: Stanley Baldwin (Conservative Party)
1925: Robert Blatchford (National Democratic Party), Philip Snowden (Independent Labour Party), H. H. Asquith (Liberal Party), Rotha Lintorn-Orman (National Vigilance Party), Joseph Devlin (Independent Nationalist Party)
Chairman of the Trades Union Congress (1926-1944)
1926-1933: Robert Blatchford (National Syndicalist faction)
1926: Philip Snowden (Orthodox Syndicalist faction), George Lansbury (Left Reformist faction), Sidney Webb (State Socialist faction)
1932: Philip Snowden (Orthodox Syndicalist faction), Sidney Webb (State Socialist faction), John Hargrave (Left Reformist faction), Henry Williamson (Agrarian Syndicalist faction)
1933-1936: Philip Snowden (Orthodox Syndicalist faction)
1933: Emmanuel Shinwell (State Socialist faction), Alexander Raven Thomson (National Syndicalist faction), Henry Williamson (Agrarian Syndicalist faction), John Hargrave (Left Reformist faction)
1936-1944: Emmanuel Shinwell (Totalist faction)
1936: Tom Mann (Orthodox Syndicalist faction), Niclas y Glais (Left Reformist faction),
1942: Scattered opposition due to wartime government
1944-1944: Eric Blair (provisional)
Prime Ministers of the United Kingdom (1944-1992)
1944-1944: Louis Mountbatten (provisional military government)
1944-1949: Murray Sueter (National, leading Wartime Coalition with Conservatives and Liberals)
1945: Lord Beaverbrook (Conservative), Herbert Samuel (Liberal), Richard Acland (Progressive)
1949-1956: Anthony Eden (Conservative, Unionist and National Liberal coalition)
1949: Clement Davies (Liberal), Archibald Ramsay (Social Credit), Richard Acland (Progressive), Alec Douglas-Home (Unionist), John Simon (National Liberal), James McSparran (Irish National Party)
1953: Dingle Foot (Liberal), John Hamilton Mackie (Social Credit), Hewlett Johnson (Progressive), Alec Douglas-Home (Unionist), Colin Thornton-Kelmsley (National Liberal), James McSparran (Irish National Party)
1956-1961: Alec Douglas-Home (Conservative and Unionist and National Liberal coalition)
1957: Jo Grimond (Liberal), Hugh Gaitskell (Progressive), John Hamilton Mackie (Social Credit), Colin Thornton-Kelmsley (National Liberal), Paddy McLogan (Irish National Party)
1961-1962: Quintin Hogg (Conservative and Unionist and National Liberal coalition)
1962-1968: Jeremy Thorpe (Liberal and Progressive Coalition)
1962: Quintin Hogg (Conservative and Unionist), Hugh Gaitskell (Progressive), Gerald Nabarro (Social Credit), Colin Thornton-Kelmsley (National Liberal), Paddy McLogan (Irish National Party)
1967: Ian MacLeod (Conservative, Unionist and National Liberal), Harold Wilson (Progressive), Gerald Nabarro (Social Credit), Gerry Fitt (Irish National Party), Gwynfor Evans (Y Mudiad Cymreig)
1968-1968: Jo Grimond (Liberal and Progressive Coalition)
1968-1971: Harold Wilson (Progressive and Liberal Coalition)
1971-1971: Louis Mountbatten (national unity government)
1971-1976: William Whitelaw (Conservative, Unionist and National Liberal majority government)
1971: Edmund Dell (Progressive Liberal), John Aspinall (Social Credit), Barbara Castle (Common Wealth), Gerry Fitt (Irish National Party), Gwynfor Evans (Y Mudiad Cymreig)
1976-1978: Edmund Dell (Progressive Liberal, Common Wealth confidence and supply)
1976: William Whitelaw (Conservative, Unionist and National Liberal), John Aspinall (Social Credit), Roy Jenkins (Common Wealth), Gerry Fitt (Irish National Party), Gwynfor Evans (Y Mudiad Cymreig)
1978-1981: Shirley Williams (Progressive Liberal, Common Wealth confidence and supply)
1981-1992: Francis Pym (Conservative, Unionist and National Liberal majority government)
1981: Shirley Williams (Progressive Liberal), John Aspinall (Social Credit), Derek Hatton (Common Wealth), John Hume (Irish National Party), Dafydd Wrigley (Y Mudiad Cymreig)
1985: Humphrey Lyttleton (Progressive Liberal), Edward McMillan Taylor (Social Credit), Derek Hatton (Common Wealth), John Hume (Irish National Party), Dafydd Wrigley (Y Mudiad Cymreig)
1990: Emlyn Hooson (Progressive Liberal), Edward McMillan Taylor (Social Credit) Jeremy Corbyn (Common Wealth), John Hume (Irish National Party), Dafydd Wrigley (Y Mudiad Cymreig)
1992: Tom King (Conservative, Unionist and National Liberal majority government)