Selby and Ainsty (UK Parliament constituency)

Further to the completion of the 2023 Periodic Review of Westminster constituencies, the seat was subject to boundary changes involving the loss of the Ainsty area.

[2] For 2010, the Boundary Commission recommended the creation of this seat following a review of parliamentary representation in York and North Yorkshire.

Until 2023, the seat had been won by the Conservative Party by a successively larger set of majorities each time it has been contested, though the 2017 general election had the unusual result of the Conservatives slightly increasing their majority despite a slight swing towards the Labour Party, mostly due to a significantly higher turnout.

On 12 June 2023 the seat became vacant following the formal resignation of the incumbent, Nigel Adams,[3] and the resulting by-election returned Labour's Keir Mather.

The constituency consisted of Census Output Areas of two local government districts with similar characteristics: a working population whose income is close to the national average and lower than average reliance upon social housing.