This list notes the number of by-elections by session since 1945-46 and also lists the successful candidate in by-elections since 2005.
UK parliamentary by-elections since 1945 (80 KB , Excel Spreadsheet)
Note: This chart is a available in the spreadsheet.
A by-election occurs when a seat in the House of Commons becomes vacant during the lifetime of a Parliament (ie between general elections), because the sitting MP dies, resigns, is elevated to the peerage, or becomes ineligible to sit for some other reason.
The by-elections page of the Parliament website provides detailed information on results, including the number of votes cast and percentage share of the vote.
See the Commons briefing on UK Election Statistics: 1918–2010 for a list of all by-elections in Great Britain and Northern Ireland.
This series of publications contains data on various subjects relating to Parliament and Government. Topics include legislation, MPs, select committees, debates, divisions and Parliamentary procedure.
Please send any comments or corrections to the Parliament & Constitution Centre. Suggestions for new lists welcomed.
UK parliamentary by-elections since 1945 (80 KB , Excel Spreadsheet)
The Elections Bill 2021-22, introduced in July 2021, completed its committee stage in the House of Commons on 26 October 2021. Remaining stages in the House of Commons are scheduled to take place on Monday 17 January 2022.
This list identifies all the women who have ever been elected to the House of Commons in the order in which they were sworn in.
Constituencies are reviewed periodically by independent Boundary Commissions, one for each part of the UK. This briefing outlines how the public can get involved in the consultation stages.
