Runcorn and Helsby is a new constituency that was only created in time for the general election in July 2024. More than half of it (51.2%) came from the former constituency of Weaver Vale, with 37.1% from Halton and the remainder from three other former constituencies - Ellesmere Port and Neston, Eddisbury, and City of Chester.

Full recount called in Runcorn and Helsby by-election as Labour and Reform separated by just four votesSource: The Independent

Triggered by the conviction of its MP for punching a constituent, Reform’s Sarah Pochin overturned Labour’s huge majority, to win it by just six votes.