| Alliance |
APNI |
Formed 21 April 1970. Registered 25 February 1999. Preceded by New Ulster Movement. MNIS Party ID 1. Electoral Commission ID PP103. |
| Anti-Waste League |
AWL |
Formed January 1921. Dissolved 1922. |
| British Socialist Party |
BSP |
Formed 1911. Dissolved 1920. Preceded by Social Democratic Federation. Succeeded by Communist Party in Great Britain and National Socialist Party. |
| British Union of Fascists |
BUF |
Formed 1 October 1932. Dissolved 10 July 1940. Later known as British Union of Fascists and National Socialists (1936) and British Union (1937). Preceded by the New Party. Succeeded by the Union Movement. |
| Change UK - The Independent Group |
CUK |
Formed 18 February 2019. Registered 15 April 2019. Dissolved 23 July 2020. Known as The Independent Group for Change (from 5 July 2019). MNIS Party ID 1007. Electoral Commission ID PP9077. |
| Coalition Conservative |
Co Con |
Political label used by members of the coalition government of 1918-1922. Not a distinctly different party to the Conservatives. Used for candidates that received the Coalition Coupon, a letter endorsing them as official representatives of the Coalition Government. |
| Coalition Liberal |
Co Lib |
Political label used by members of the coalition government of 1918-1922. Not a distinctly different party to the Liberal Party. Used for candidates that received the Coalition Coupon, a letter endorsing them as official representatives of the Coalition Government. |
| Common Wealth Party |
CW |
Formed 26 July 1942. Dissolved 1993. |
| Communist Party of Great Britain |
CPGB |
Formed 31 July 1920. Dissolved 23 November 1991. Succeeded by the Democratic Left and later the Communist Party of Britain. |
| Conservative |
Con |
Formed 1834 (original form), 1912 (current form). Registered 14 January 1999. Preceded by the Tory Party and the Liberal Unionist Party. MNIS Party ID 4. Electoral Commission ID PP51 (NI) PP52 (GB). |
| Constitutionalist |
Const |
Political label used by candidates standing in the 1920s. There was no party organisation called the Constitutionalist Party. Candidates using this label who were elected did not act or vote together as a group, taking the whip of other parties. |
| Co-operative Party |
Co-op |
Formed 17 October 1917. Registered 25 February 1999. Electoral Commission ID PP119. Formed an electoral agreement with Labour on 7 June 1927, meaning they only stand Labour and Co-operative joint candidates. |
| Crofters' Party |
CP |
Formed 1885. Dissolved 1890s. Parliamentary arm of the Highland Land League. |
| Democratic Labour Party |
DLP |
Formed 1972. Dissolved 1980. Preceded by Labour (split). Succeeded by Social Democratic Alliance (merger). MNIS Party ID 85. Electoral Commission ID . |
| Democratic Unionist Party |
DUP |
Formed 30 September 1971. Registered 14 January 1999. Preceded by Protestant Unionist Party. MNIS Party ID 7. Electoral Commission ID PP70. |
| Empire Free Trade Crusade |
EFTC |
Formed July 1929. Dissolved late 1930s. |
| Green Party |
Green |
Formed 1985. Registered 25 February 1999. Preceded by Ecology Party. MNIS Party ID 44. Electoral Commission ID PP305 (NI) PP63 (GB). |
| Home Rule League |
HRL |
Formed 1873. Dissolved 1882. Also known as the Home Rule Party. Preceded by Home Government Association. Succeeded by Irish Parliamentary Party. |
| Independent |
Ind |
Description used by political candidates who lack a formal affiliation to a party. MNIS Party ID 8. |
| Independent Christian Pacifist |
Ind CP |
Description used by political pacifists who lack a formal affiliation to a party. |
| Independent Conservative |
Ind Con |
Description used by political conservatives who lack a formal affiliation to the party of that name. MNIS Party ID 9. |
| Independent Kidderminster Hospital and Health Concern |
KHHC |
Formed 27 January 2000. Registered 27 January 2000. Dissolved 2023. Later known as Independent Community & Health Concern (2001). MNIS Party ID 99. Electoral Commission ID PP44. |
| Independent Labour |
Ind Lab |
Description used by political labour candidates who lack a formal affiliation to a party. MNIS Party ID 10. |
| Independent Labour Party |
ILP |
Formed 1893. Affiliated with the Labour Party from their formation in 1900 (as the Labour Representation Committee) until August 1932. Dissolved 1975. Succeeded by Labour Party (merger). MNIS Party ID 11. |
| Independent Liberal |
Ind Lib |
Description used by political liberals who lack a formal affiliation to a party. |