Party |
Founded |
First represented |
Last represented |
Dissolved |
Maximum representation |
MPs |
Notes |
All-for-Ireland League |
1921 |
1909 |
1918 |
1918 |
8 (1910) |
|
|
Alliance Party of Northern Ireland |
1970 |
1973 |
Present |
N/A |
1 (1973) |
Naomi Long; Stratton Mills |
|
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 |
|
British Socialist Party |
1911 |
1920 |
1920 |
1920 |
1 (1920) |
Cecil L'Estrange Malone |
Merged into the Communist Party of Great Britain |
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 |
|
Co-operative Party |
1917 |
1918 |
Present |
N/A |
30 (2001) |
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 |
9 (2005) |
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 |
1 (1992) |
Cynog Dafis; Caroline Lucas |
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 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 Representation Committee |
1900 |
1900 |
1906 |
1906 |
29 (1906) |
List |
Became the Labour Party |
Liberal Democrats |
1988 |
1988 |
Present |
N/A |
62 (2005) |
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) |
|
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 |
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 |
|
|
|
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 |
1996 |
1997 |
1997 |
1997 |
1 (1997) |
George Gardiner |
|
Republican Labour Party |
1964 |
1966 |
1970 |
1973 |
1 (1970) |
Gerry Fitt |
|
Respect Party |
2004 |
2005 |
Present |
N/A |
1 (2005) |
George Galloway |
|
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 |
11 (1979) |
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 and Labour Party |
1970 |
1970 |
Present |
N/A |
4 (1992) |
List |
|
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 |
2010 |
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 |
United Kingdom Independence Party |
1993 |
2008 |
Present |
N/A |
1 (Present) |
Douglas Carswell |
|
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 |