By-election for the constituency of Selby and Ainsty on 20 July 2023
A by-election to the 58th Parliament of the United Kingdom for the constituency area of Selby and Ainsty.
Labour gain from Conservatives by Keir Mather with a majority of 4,161 - 11.6% - on a turnout of 44.7%.
An electorate of 80,150, having a valid vote count of 35,807 and an invalid vote count of 69.
Candidates
| Name | Party | Vote | Vote share | Vote change |
|---|---|---|---|---|
| MATHER, Keir | Lab | 16,456 | 46.0% | 21.4% |
| HOLMES, Claire | Con | 12,295 | 34.3% | -25.9% |
| WARNEKEN, Arnold | Green | 1,838 | 5.1% | 1.9% |
| JORDAN, Mike | Yrks | 1,503 | 4.2% | 0.8% |
| KENT, David | RUK | 1,332 | 3.7% | - |
| WALKER, Matt | LD | 1,188 | 3.3% | -5.3% |
| PALMER, Nick | Ind | 342 | 1.0% | - |
| WATERSTON, John | SDP | 314 | 0.9% | - |
| ARCHIBALD STANTON, Sir | MRLP | 172 | 0.5% | - |
| PHOENIX, Guy | HPUK | 162 | 0.5% | - |
| GRAY, Andrew | Ind | 99 | 0.3% | - |
| WILSON-KERR, Tyler | Ind | 67 | 0.2% | - |
| WELLOCK, Luke | Cli | 39 | 0.1% | - |
The writ for this by-election was issued on 14 June 2023.
Gain or hold information and vote change percentages are calculated according to changes since the preceding general election and take no account of intervening by-elections. The calculations are based on changes to party performance, rather than the performance of an individual candidate. Where the boundary of a constituency has changed since the preceding general election, the calculations are based on estimated notional results for the new boundaries at the previous election.
Under section 13(b) of the Representation of the People Act 1985, a candidate gaining 5% or less of the vote share will forfeit their deposit.