Party
|
Founded
|
First represented
|
Last represented
|
Dissolved
|
Maximum representation
|
MPs
|
Notes
|
Alba Party
|
2021
|
2021
|
2024
|
N/A
|
2 (2021)
|
Kenny MacAskill; Neale Hanvey
|
Split from the Scottish National Party
|
All-for-Ireland League
|
1909
|
1909
|
1918
|
1918
|
8 (1910)
|
|
|
Alliance Party of Northern Ireland
|
1970
|
1973
|
Present
|
N/A
|
1 (1973)
|
Stephen Farry; Naomi Long; Stratton Mills; Sorcha Eastwood
|
|
Anti H-Block
|
1981
|
1981
|
1982
|
1982
|
1 (1981)
|
Bobby Sands; Owen Carron
|
Merged into Sinn Féin
|
Anti-Waste League
|
1921
|
1921
|
1922
|
1922
|
2 (1921)
|
James Malcolm Monteith Erskine; Murray Sueter
|
|
Blaenau Gwent People's Voice
|
2005
|
2010
|
2011
|
2011
|
1 (2010)
|
Peter Law, Dai Davies
|
|
British Socialist Party
|
1911
|
1920
|
1920
|
1920
|
1 (1920)
|
Cecil L'Estrange Malone
|
Merged into the Communist Party of Great Britain
|
Change UK
|
2019
|
2019
|
2019
|
2019
|
11 (2019)
|
List
|
Split from the Labour and Conservative Parties in February 2019, dissolved December 2019
|
Christian Pacifist (Fellowship of Reconciliation)
|
1915
|
1923
|
1924
|
N/A
|
1 (1923)
|
George M. Ll. Davies
|
|
Coalition Labour
|
1918
|
1918
|
1922
|
1922
|
|
|
Colne Valley Labour Union
|
1891
|
1907
|
1910
|
1918
|
1 (1907)
|
Victor Grayson
|
Won the 1907 Colne Valley by-election
|
Commonwealth Labour Party
|
1942
|
1942
|
1947
|
1947
|
1 (1942)
|
Harry Midgley
|
|
Common Wealth Party
|
1942
|
1942
|
1946
|
1993
|
5 (1945)
|
List
|
|
Communist Party of Great Britain
|
1920
|
1920
|
1950
|
1991
|
2 (1945)
|
Willie Gallacher; Cecil L'Estrange Malone; Walton Newbold; Phil Piratin; Shapurji Saklatvala
|
|
Conservative Party
|
1835
|
1835
|
Present
|
N/A
|
473 (1931)
|
List
|
|
Constitutionalists
|
1923
|
1923
|
1925
|
1929
|
12 (1923)
|
Winston Churchill, Hamar Greenwood, Algernon Moreing, Thomas Robinson, John Ward, Abraham England, Henry Hogbin, John Sturrock
|
Co-operative Party
|
1917
|
1918
|
Present
|
N/A
|
38 (2017)
|
List
|
Affiliated with the Labour Party since 1927
|
Democratic Labour
|
1972
|
1972
|
1974
|
1979
|
1 (1972)
|
Dick Taverne
|
|
Democratic Party
|
1969
|
1969
|
1970
|
1971
|
1 (1969)
|
Desmond Donnelly
|
|
Democratic Unionist Party
|
1971
|
1971
|
Present
|
N/A
|
10 (2017)
|
List
|
Formed from the Protestant Unionist Party
|
Empire Free Trade Crusade
|
1929
|
1930
|
1931
|
1930s
|
1 (1930)
|
Ernest Taylor
|
Joint candidate with the United Empire Party
|
English National Party
|
1960s
|
1976
|
1976
|
1980
|
1 (1976)
|
John Stonehouse
|
|
Federation of Labour
|
1944
|
1945
|
1949
|
1949
|
1 (1945)
|
Jack Beattie
|
Merged into the Irish Labour Party
|
Green Party of England and Wales
|
1973
|
1992
|
Present
|
N/A
|
4 (2024)
|
Cynog Dafis; Caroline Lucas; Sian Berry; Carla Denyer; Ellie Chowns; Adrian Ramsay
|
Dafis was a joint candidate with Plaid Cymru
|
Crofters Party
|
1880s
|
1885
|
1895
|
1890s
|
4 (1885)
|
Gavin Brown Clark; Charles Fraser-Mackintosh; Roderick MacDonald; Donald Horne Macfarlane
|
|
Independent Alliance (UK)
|
2024
|
2024
|
|
|
5 (2024)
|
Jeremy Corbyn, Shockat Adam, Adnan Hussain, Iqbal Mohamed, Ayoub Khan
|
Not a full-fledged party, but a Technical group
|
Independent Irish Party
|
1852
|
1852
|
1858
|
1858
|
40 (1852)
|
|
Split from the Liberal Party
|
Independent Kidderminster Hospital and Health Concern
|
2000
|
2001
|
2010
|
N/A
|
1 (2001)
|
Richard Taylor
|
|
Independent Liberals
|
1931
|
1931
|
1935
|
1935
|
5 (1931)
|
David Lloyd George; Gwilym Lloyd George; Megan Lloyd George; Frank Owen; Goronwy Owen
|
Not a separate party per se; its members were official Liberal Party candidates who rejected the National Government.
|
Independent Labour Party
|
1893
|
1893
|
1947
|
1975
|
|
|
Affiliated with the Labour Party from 1900 until 1931
|
Independent Parliamentary Group
|
1920
|
1920
|
1921
|
1921
|
|
|
|
Irish Confederate Party
|
1847
|
1847
|
1848
|
1848
|
2 (1847)
|
Thomas Chisholm Anstey; William Smith O'Brien
|
|
Irish Labour Party
|
1912
|
1949
|
1955
|
N/A
|
1 (1949)
|
Jack Beattie
|
|
Labour Independent Group
|
1949
|
1949
|
1950
|
1950
|
5 (1949)
|
Lester Hutchinson; John Platts-Mills; Denis Nowell Pritt; Leslie Solley; Konni Zilliacus
|
|
Labour Party
|
1906
|
1906
|
Present
|
N/A
|
418 (1997)
|
List
|
Formed from the Labour Representation Committee
|
Labour Independent Group
|
1949
|
1949
|
1950
|
1950
|
5 (1949)
|
Denis Pritt, Lester Hutchinson, John Platts-Mills, Leslie Solley, Konni Zilliacus
|
Denis Pritt was expelled from the Labour Party in 1940 for supporting the Soviet Union in the Winter War, the rest were for supporting Soviet Foreign Policy
|
Labour Representation Committee
|
1900
|
1900
|
1906
|
1906
|
29 (1906)
|
List
|
Became the Labour Party
|
Liberal Democrats
|
1988
|
1988
|
Present
|
N/A
|
72 (2024)
|
List
|
Merger of the Liberal Party and the Social Democratic Party
|
Liberal Party
|
1859
|
1859
|
1988
|
1988
|
397 (1906)
|
List
|
Merged into the Liberal Democrats
|
Liberal Unionist Party
|
1886
|
1886
|
1912
|
1912
|
77 (1886)
|
List
|
Split from the Liberal Party; merged into the Conservative Party
|
Mebyon Kernow
|
1951
|
1964
|
1970
|
N/A
|
2 (1964)
|
Peter Bessell, John Pardoe, David Mudd
|
multi party membership
|
Militant tendency
|
1964
|
1983
|
1991
|
1991
|
4 (1983)
|
Eric Heffer, Dave Nellist, Terry Fields, Pat Wall
|
National Association of Discharged Sailors and Soldiers
|
1916
|
1918
|
1921
|
1921
|
1 (1918)
|
Robert Hewitt Barker
|
Semi-official candidate, sponsored by local branch of organisation
|
National Democratic and Labour Party
|
1918
|
1918
|
1922
|
1923
|
9 (1918)
|
|
|
National Party
|
1917
|
1917
|
1921
|
1921
|
8 (1917)
|
|
|
Nationalist Party (Ireland)
|
1870
|
1870
|
1955
|
1977
|
86 (1885)
|
List
|
|
National Labour
|
1931
|
1931
|
1945
|
1945
|
14 (1931)
|
List
|
|
National Liberal Party
|
1931
|
1931
|
1968
|
1968
|
55 (1950)
|
List
|
Affiliated with the Conservative Party from 1947
|
National Socialist Party
|
1916
|
1918
|
1919
|
1919
|
3 (1918)
|
Dan Irving; Jack Jones; Will Thorne
|
Affiliated with the Labour Party
|
New Party
|
1930
|
1930
|
1931
|
1932
|
6 (1931)
|
Oliver Baldwin; W. J. Brown; Robert Forgan; Cynthia Mosley; Oswald Mosley; John Strachey
|
Baldwin and Brown held membership for a single day
|
Nordic League
|
1935
|
1935
|
1939
|
1939
|
1 (1935)
|
Archibald Maule Ramsay
|
|
Northern Ireland Labour Party
|
1924
|
1943
|
1943
|
1987
|
1 (1943)
|
Jack Beattie
|
|
Plaid Cymru
|
1925
|
1966
|
Present
|
N/A
|
4 (1992)
|
List
|
|
Protestant Unionist Party
|
1966
|
1970
|
1971
|
1971
|
1 (1970)
|
Ian Paisley
|
Became the Democratic Unionist Party
|
Referendum Party
|
1994
|
1997
|
1997
|
1997
|
1 (1997)
|
George Gardiner
|
|
Republican Labour Party
|
1964
|
1966
|
1970
|
1973
|
1 (1970)
|
Gerry Fitt
|
|
Reclaim Party
|
2020
|
2023
|
2023
|
N/A
|
1 (2023)
|
Andrew Bridgen
|
Reform League
|
1865
|
1865
|
1869
|
1869
|
6 (1865)
|
George Howell (trade unionist), Sir Wilfrid Lawson, 2nd Baronet, of Brayton, Peter Alfred Taylor, Samuel Morley (MP), Charles Bradlaugh, John Bright
|
Reform UK
|
2018
|
2024
|
N/A
|
N/A
|
5 (2024)
|
Lee Anderson; Nigel Farage; Rupert Lowe; Richard Tice; James McMurdock
|
Founded as the Brexit Party
|
Respect Party
|
2004
|
2005
|
2015
|
2016
|
1 (2005)
|
George Galloway
|
|
Russellite Unionist
|
1904
|
1904
|
1910
|
1910
|
3 (1904)
|
Sir Thomas Russell, 1st Baronet, James Wood, Edward Mitchell, Robert Glendinning
|
|
Scotland United
|
2023
|
2023
|
Present
|
N/A
|
3 (2023)
|
Kenny MacAskill; Neale Hanvey; Angus MacNeil
|
Political Grouping
|
Scottish Labour Party (1888)
|
1888
|
1888
|
1892
|
1893
|
1 (1888)
|
Robert Cunninghame-Graham
|
Merged into the Independent Labour Party
|
Scottish Labour Party (1976)
|
1976
|
1976
|
1979
|
1979
|
2 (1976)
|
John Robertson; Jim Sillars
|
Split from the Labour Party
|
Scottish National Party
|
1934
|
1945
|
Present
|
N/A
|
56 (2015)
|
List
|
|
Scottish Prohibition Party
|
1901
|
1922
|
1931
|
1935
|
1 (1922)
|
Edwin Scrymgeour
|
|
Sinn Féin
|
1905
|
1917
|
Present
|
N/A
|
73 (1918)
|
List
|
Sinn Féin MPs do not take their seats
|
Social Democratic Party
|
1981
|
1981
|
1988
|
1988
|
29 (1982)
|
List
|
Merged into the Liberal Democrats
|
Social Democratic Party (1988)
|
1988
|
1988
|
1990
|
1990
|
29 (1982)
|
Rosie Barnes, John Cartwright, David Owen
|
Formed by Social Democratic Party members who did not join the Liberal Democrats
|
Social Democratic and Labour Party
|
1970
|
1970
|
Present
|
N/A
|
4 (1992)
|
List
|
|
Traditional Unionist Voice
|
2007
|
2024
|
Present
|
N/A
|
1 (2024
|
Jim Allister
|
|
UK Unionist Party
|
1995
|
1995
|
2001
|
2008
|
1 (1995)
|
Robert McCartney
|
|
Ulster Popular Unionist Party
|
1980
|
1980
|
1995
|
1995
|
1 (1980)
|
James Kilfedder
|
|
Ulster Unionist Labour Association
|
1918
|
1918
|
1922
|
N/A
|
3 (1918)
|
Thomas Henry Burn; Thompson Donald; Samuel McGuffin
|
Linked with the Ulster Unionist Party
|
Ulster Unionist Party
|
1905
|
1905
|
2017
|
N/A
|
20 (1918)
|
List
|
At times affiliated to the Conservative Party
|
United Empire Party
|
1920s
|
1930
|
1931
|
1930s
|
1 (1930)
|
Ernest Taylor
|
Joint candidate with the Empire Free Trade Crusade
|
United Ulster Unionist Party
|
1975
|
1975
|
1982
|
1982
|
1 (1975)
|
John Dunlop
|
Split from the Vanguard Unionist Progressive Party
|
UK Independence Party
|
1993
|
2008
|
2017
|
N/A
|
2 (2014)
|
Douglas Carswell; Mark Reckless
|
|
Unity
|
1960s
|
1969
|
1974
|
1977
|
2 (1970)
|
Bernadette Devlin; Frank McManus
|
|
Vanguard Unionist Progressive Party
|
1973
|
1973
|
1978
|
1978
|
3 (1974)
|
Robert Bradford; William Craig; John Dunlop
|
Split from and later merged into the Ulster Unionist Party
|
Workers Party of Britain
|
2019
|
2024
|
N/A
|
N/A
|
1 (2024)
|
George Galloway
|
Repeal Association
|
1830
|
1832
|
1847
|
1848
|
42 (1832)
|
|
Also Known as the Irish Repeal Party
|
Home Rule League
|
1873
|
1874
|
1880
|
1882
|
59 (1874)
|
|
Became the Irish Parliamentary Party
|
Liberal–Labour
|
1870
|
1874
|
1918
|
1918
|
|
|
Independent Conservative
|
1911
|
1911
|
N/A
|
N/A
|
|
|
Independent Nationalist
|
1880
|
1880
|
1955
|
N/A
|
N/A
|
|
Not a Political Party but a Description for Irish Nationalist who are not affiliated with a Political Party same meaning as the Description used in the Northern Ireland Assembly today
|
Chartist
|
1838
|
1847
|
1852
|
1857
|
1 (1847)
|
|
|
Birkenhead Social Justice
|
2019
|
2019
|
2019
|
2019
|
1 (2019)
|
|
|
The Independents (UK)
|
2019
|
2019
|
2019
|
2019
|
5 (2019)
|
Gavin Shuker, John Woodcock, Luciana Berger, Angela Smith, Heidi Allen
|
|
Scottish Socialist Party (1932)
|
1932
|
1932
|
1940
|
1940
|
2 (1932)
|
Neil Maclean, Thomas Johnston
|
|
Ministerialist
|
1768
|
1768
|
1774
|
1774
|
225 (1766)
|
Lord North
|
|
Northite
|
1774
|
1774
|
1784
|
1784
|
396 (1780)
|
|
Rockingham Whigs
|
1765
|
1768
|
1784
|
1784
|
254 (1780)
|
William Dowdeswell, Henry Seymour Conway
|
|
Grenville Whigs
|
1740
|
1765
|
1774
|
1774
|
41 (1768)
|
George Grenville
|
|
Bedford Whigs
|
1751
|
1751
|
1774
|
1783
|
23 (1751)
|
|
|
Radicals
|
1750
|
1768
|
1857
|
1859
|
15 (1852)
|
|
|