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.
MPs' parliamentary activities: An interactive dashboard
Filter by constituency to explore MPs' parliamentary activities, including the debates and urgent questions they raise, and how they vote in divisions.
Elections data
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
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UK Election Statistics: 1918-2023: A century of elections
This briefing gives an overview of UK election results since 1918, including for the UK Parliament, European Parliament, devolved legislatures and local government.
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Constituency data: electorates
Constituency-level data on electorates in the UK, including data for both the parliamentary and the local government franchise
Government data
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
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Government Chief Whips and Deputy Whips since 1945
Government Chief Whips and Deputy Chief Whips in the Commons and Lords since 1945
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Attendance of the Prime Minister at Prime Minister’s Questions (PMQs) since 1979
Prime Minister's Questions (PMQs) attended by Prime Ministers since 1979 with details of ministers providing cover.
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Ministers in the Conservative Governments: 2015, 2017 and 2019 Parliaments
This list notes ministerial office holders since the 2015 General Election.
MP data
Find quick-read articles, datasets and longer briefings on the makeup of the UK Parliament and the characteristics of MPs
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MPs’ changes of party allegiance in the House of Commons since 1979
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.
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Apologies by MPs to the House of Commons since 1979
This list attempts to capture all instances where an apology has been made on the floor of the House of Commons since 1979.
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MPs who have withdrawn from the Commons Chamber or who have been suspended
This list notes MPs who have left the Chamber voluntarily, been asked to withdraw, or who have been suspended.
Parliamentary data
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
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Expedited legislation: Public bills receiving their second and third readings on the same day in the House of Commons
Public bills since 1979 whose main Commons stages have been passed within one day.
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Government Chief Whips and Deputy Whips since 1945
Government Chief Whips and Deputy Chief Whips in the Commons and Lords since 1945
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Addresses to Members of both Houses of Parliament
Heads of state and dignitaries who have addressed MPs and Members of the House of Lords since 1935.
