Videos
Short data videos on by-elections, results and our insight reports. Free to use with credit: Source: Psephology.AI (psephology.ai).
Thursday, 22 October 2026
Grantham St Wulfram's by-election preview: Independent 4.6 points ahead in 2023
Grantham St Wulfram's votes on 22 October 2026 in a South Kesteven by-election. An Independent topped the poll in May 2023 with 41.1%, 4.6 points ahead of the Conservatives.
Thursday, 29 October 2026
St James's by-election preview: Reform UK 27 points clear in May
St James's in Dudley votes on 29 October 2026. Reform UK won in May 2026 with 48.9%, 27.1 points ahead of Labour, and Restore Britain stand for the first time.
Thursday, 29 October 2026
Southwell by-election preview: Conservatives 13.3 points ahead in 2025
Southwell votes on 29 October 2026 in a Nottinghamshire County Council by-election. The Conservatives won in May 2025 with 37.5%, 13.3 points ahead of Reform UK.
Thursday, 24 September 2026
Queen's Park by-election: Green gain from Labour in Brighton
The Greens gained Queen's Park in Brighton & Hove from Labour on 24 September 2026 with 50.1%, up 26.1 points on 2023. Labour fell to 35.3%.
Thursday, 8 October 2026
Kilburn, Denby, Holbrook & Horsley by-election: Greens win four-way fight
The Greens won the Amber Valley by-election on 8 October 2026 with 29.5%, ahead of Reform UK on 27.0%. Labour, who topped the poll in 2023 with 37.1%, fell to 15.9%.
Thursday, 8 October 2026
Holborn & St Pancras by-election: Labour hold as Polanski's Greens surge to 32.8%
Labour held Keir Starmer's former seat on 8 October 2026 with 45.2%. Green leader Zack Polanski came second on 32.8%, up 22.4 points on the Greens' 2024 share, and Labour's majority fell from 30.0 to 12.4 points.
Thursday, 1 October 2026
Hirst by-election: Labour gain from Reform UK as Reform falls 20 points
Labour gained Hirst in Northumberland from Reform UK on 1 October 2026 with 50.1%. Reform UK fell from 50.0% in May 2025 to 30.0%, and Restore Britain took 10.3% at its first attempt.
Thursday, 22 October 2026
Hertford Kingsmead by-election preview: Greens defend 2023 poll lead
Hertford Kingsmead votes on 22 October 2026. The Greens topped the poll in 2023 with 36.8%, 10.4 points ahead of the Conservatives, and Reform UK stand for the first time.
Thursday, 1 October 2026
Claremont by-election: Labour hold Blackpool seat as Reform close in
Labour held Claremont in Blackpool on 1 October 2026 with 41.8%, down 10.5 points on 2023. Reform UK, standing for the first time, took 38.2%.
Thursday, 22 October 2026
Calverley & Farsley by-election preview: Conservatives 9.3 points ahead in May
Calverley & Farsley votes on 22 October 2026. The Conservatives topped the poll in May 2026 with 36.6%, 9.3 points ahead of Labour, and seven candidates are standing.
Thursday, 24 September 2026
Blockley by-election: Conservative gain from Green as Green vote falls 49 points
The Conservatives gained Blockley in the Cotswolds from the Greens on 24 September 2026 with 54.7%. The Green share fell from 56.3% in 2023 to 6.9%.
Thursday, 29 October 2026
Beechwood & Heath by-election preview: a 5.2-point gap between Lib Dems and Reform
Beechwood & Heath votes on 29 October 2026. The Liberal Democrats won in May 2026 with 44.7%, just 5.2 points ahead of Reform UK.
Thursday, 1 October 2026
Amble by-election: Labour gain from Reform UK
Labour gained Amble in Northumberland from Reform UK on 1 October 2026 with 38.8%. Reform UK fell from 44.4% in May 2025 to 33.5%.
Thursday, 15 October 2026
Shepshed by-election preview: Reform won here by 19.5 points in 2025
Shepshed votes on 15 October in a Leicestershire County Council by-election. Reform UK won it in May 2025 with 44.9%, 19.5 points ahead of the Conservatives, and Restore Britain stands for the first time.