The sole event in this period concerns the by-election for Keir Starmer's former Holborn and St Pancras seat, triggered by his resignation. Green Party leader Zack Polanski confirmed his candidacy and framed his campaign as a challenge to Starmer's legacy. The by-election is seen as an early electoral test for new Prime Minister Andy Burnham, though Starmer himself is not directly involved or responding.
- Green Party leader Zack Polanski confirmed he will stand for Keir Starmer's former Holborn and St Pancras seat following Starmer's resignation.
- Polanski framed the by-election as a referendum on Starmer's legacy on welfare, foreign policy, and Gaza.
- The by-election, expected in autumn 2026, is seen as a major electoral test for new Prime Minister Andy Burnham in a traditionally safe Labour seat.