The date by which Prime Minister Keir Starmer is expected to announce his resignation has been pushed back by 2 days, from 15 Sept 2026 to 17 Sept 2026, according to the latest Polymarket data.
The shift in the implied resignation date comes as the probability of Starmer remaining as PM on 17 Sept has increased to ~86%, up from ~82% previously. Polymarket traders are now betting the Labour leader is more likely to stay in office beyond the middle of September.