Political parties
Parties in Parliament
Every party with MPs in the House of Commons, largest first, each with a short factual summary. For a party's own account of what it stands for, follow the link to its website. A further 13 MPs sit as independents, not affiliated to a party.
Government Labour Lab
403 MPs · 217 peers
The governing party and, historically, the main centre-left party in Britain, with long-standing ties to the trade union movement. It contests seats across Great Britain.
Official Opposition Conservative Con
117 MPs · 251 peers
The Official Opposition and, historically, the main centre-right party in Britain. Its full name is the Conservative and Unionist Party, and it contests seats across Great Britain.
Liberal Democrat LD
71 MPs · 74 peers
A centrist, socially liberal party that champions civil liberties, electoral reform and closer ties with Europe. It contests seats across Great Britain.
Scottish National Party SNP
8 MPs
A centre-left party whose central aim is independence for Scotland. It stands for election only in Scotland.
Reform UK RUK
7 MPs
A right-wing party, formerly the Brexit Party, that campaigns for much lower immigration and a smaller state. It contests seats across Great Britain.
Sinn Féin SF
7 MPs
A left-wing Irish republican party in Northern Ireland that seeks a united Ireland. By long-standing policy its MPs do not take their seats at Westminster.
Democratic Unionist Party DUP
5 MPs · 6 peers
The largest unionist party in Northern Ireland: socially conservative and committed to Northern Ireland remaining in the United Kingdom.
Green Party Green
5 MPs · 2 peers
A left-wing party focused on environmental protection and social justice. It is the Green Party of England and Wales.
Plaid Cymru PC
4 MPs · 2 peers
A centre-left party that campaigns for Welsh independence and stands for election only in Wales.
Social Democratic & Labour Party SDLP
2 MPs
A centre-left, Irish nationalist party in Northern Ireland that seeks a united Ireland by consent.
Alliance APNI
1 MP
A liberal, cross-community party in Northern Ireland that designates as neither unionist nor nationalist.
Traditional Unionist Voice TUV
1 MP
A unionist party in Northern Ireland, critical of the Stormont power-sharing arrangements it regards as weakening the union.
Ulster Unionist Party UUP
1 MP · 3 peers
A unionist party in Northern Ireland, committed to maintaining the union with Great Britain.
Seat numbers come from the official UK Parliament data; external links go to each party's own website.