The Prime Minister's resignation date has been pushed back by 1 day to 12 September 2026, according to the latest Polymarket data. The shift comes as markets assess the likelihood of Keir Starmer remaining in office beyond the previously expected 11 September 2026 date.
The move suggests an ~86% chance that Starmer will still be PM on 12 September 2026, up from the previous ~86% chance he would resign by 11 September. Polymarket traders are adjusting their bets on the PM's future as the political landscape continues to evolve.