Commons Briefing paper by Isabel Buchanan and Elliot Bridges. It was first published on Tuesday, 20 May 2025. It was last updated on Tuesday, 23 June 2026.

By-elections in the 2024 Parliament

This research briefing sets out results of the by-elections held during the 2024 Parliament. Results for previous by-elections for parliaments since 1997 are available in the following briefings:

By-elections since 1945 are also summarised in UK Election Statistics: 1918-2023.

By-elections in the 2024 Parliament:

Runcorn and Helsby – 1 May 2025

Winner: Sarah Pochin (Reform).

Gorton and Denton - 26 Feb 2026

Winner: Hannah Spencer (Green).

Makerfield - 18 Jun 2026

Winner: Andy Burnham (Labour and Co-operative).

Aberdeen South - 18 Jun 2026

Winner: Douglas Lumsden (Conservative).

Arbroath and Broughty Ferry - 18 Jun 2026

Winner: Lara Bird (SNP).

Full results of each by-election can be found on our election results website and in the files attached to this page.

Download full report

Secondary information

Type: Research briefing
Reference: CBP-10268
Subjects: Candidates By-elections Political parties Voting behaviour
Contains statistics: Yes
Published by: Social and General Statistics Section; House of Commons Library
Link: View this Research briefing on researchbriefings.parliament.uk