UK parliamentary by-elections since 1945
This list notes the number of by-elections by session since 1945-46 together with a list of the the successful candidates 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 together with a list of the the successful candidates in by-elections since 2005.
This briefing gives an overview of UK election results since 1918, including for the UK Parliament, European Parliament, devolved legislatures and local government.
Constituency-level data on electorates in the UK, including data for both the parliamentary and the local government franchise
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
Government Chief Whips and Deputy Chief Whips in the Commons and Lords since 1945
Prime Minister's Questions (PMQs) attended by Prime Ministers since 1979 with details of ministers providing cover.
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
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.
This list attempts to capture all instances where an apology has been made on the floor of the House of Commons since 1979.
This list notes MPs who have left the Chamber voluntarily, been asked to withdraw, or who have been suspended.
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
Public bills since 1979 whose main Commons stages have been passed within one day.
Government Chief Whips and Deputy Chief Whips in the Commons and Lords since 1945
Heads of state and dignitaries who have addressed MPs and Members of the House of Lords since 1935.