Parties and elections
This selection of research briefings provides information on political parties and elections in the UK. Find data on the leaders and officials in the main parties, MPs who have changed party allegiance and the number of by-elections that have been held.
Parties
Conservative Party leaders and officials since 1975
List of leaders, deputy leaders, party Chairs and 1922 Committee Chairs of the Conservative Party from 1975 to present day
Labour Party leaders and officials since 1975
List of Labour leaders, deputy leaders, National Executive Committee Chairs and Parliamentary Labour Party Chairs from 1975 to present
Liberal Democrat Party leaders and officials since 1975
List of leaders and officials of the Liberal Party, Social Democratic Party and Liberal Democrats from 1975 to present day
Scottish National Party leaders and officials since 1975
List of leaders, deputy leaders and officials of the Scottish National Party from 1975 to present day
Democratic Unionist Party (DUP): Leaders and officials since 1971
List of DUP leaders, deputy leaders, party leaders and chairmen from 1971 to present
MPs' changes of party allegiance in the Commons since 1979
Record of Members from 1979 who changed allegiance from one party to another, decided to sit as an independent MP or who lost the whip
Elections
General Election 2017: full results and analysis
Detailed analysis of the 2017 general election, including results by party and constituency, analysis of voter trends and MP characteristics
UK election statistics: 1918–2018 – 100 years of elections
Overview of election results from 1918 to 2018, focusing on elections to the House of Commons
UK by-elections since 1945
Notes the number of by-elections to the House of Commons from 1945 to present day and provides by-elections results since 2005
UK by-elections held more than 3 months after vacancy
Table of by-elections from 1974 to present day that have taken place more than three months after the vacancy
Turnout at elections
Statistics on turnout at both national and local elections as well as the devolved administrations and European Parliament elections
Image: PA / Lynne Cameron