The date by which Prime Minister Keir Starmer is expected to announce his resignation has been moved forward by 3 days, according to the latest Polymarket data. The new expected resignation date is now 12 Sept 2026, down from the previous 15 Sept 2026.
The shift in the implied resignation date comes as the probability of Starmer remaining PM by that date has fallen to ~86%. Polymarket traders are increasingly betting that the Labour leader will step down earlier than previously expected.