UK parliamentary by-elections since 1945
This list notes the number of by-elections by session since 1945-46 and also lists the successful candidate in by-elections since 2005.

Explore and download data about Parliament, MPs, elections and the Government. Use our data freely and flexibly under the conditions of the Open Parliament Licence.
Filter by constituency to explore MPs' parliamentary activities, including the debates and urgent questions they raise, and how they vote in divisions.
Access briefings and original datasets covering UK Parliament elections from 1918, including by-elections from 1945. Find data by constituency as well as original analysis of election results
This list notes the number of by-elections by session since 1945-46 and also lists the successful candidate in by-elections since 2005.
Constituency-level data on electorates in the UK, including data for both the parliamentary and the local government franchise
Explore the 2021 local election results handbook and download a comprehensive results dataset for English electoral districts and wards.
Read the latest data about the activity of members of the government in Parliament. Here, you can access a range of facts and figures in various formats about the government
This list notes the number of Prime Minister's Questions (PMQs) attended by Prime Ministers since 1979.
This list notes Cabinet meetings held away from Downing Street. Regional Cabinet meetings were introduced by Gordon Brown in 2008 and continued under David Cameron's Coalition Government. Theresa May held two regional Cabinet meeting in 2017 and 2018, and Boris Johnson in 2020 and 2022. Prior to 2008, Cabinet meetings outside London were extremely rare.
This list notes ministerial office holders since the 2015 General Election.
Find quick-read articles, datasets and longer briefings on the makeup of the UK Parliament and the characteristics of MPs
House of Commons select committee chairs in the 2019, 2017, 2015 and 2010 parliaments.
This list notes MPs who have left the Chamber voluntarily, been asked to withdraw, or who have been suspended.
This list notes when a Member has changed allegiance from one political party to another or decided to sit as an independent MP. Instances of Members losing or resigning a party whip are also noted.
Find facts and figures relating to legislation, MPs, ministers, select committees, debates, divisions and parliamentary procedure. Some lists date back hundreds of years to the present day but many cover the last seven to ten Parliaments
This briefing paper discusses the procedure for recalling Parliament, as well as providing details of recent occasions when Parliament has been recalled.
This list notes the number of Prime Minister's Questions (PMQs) attended by Prime Ministers since 1979.
Maiden speeches by newly elected MPs since 1918