The deadline for Prime Minister Keir Starmer to announce his resignation has been pushed back by 1 day, from 18 Sept 2026 to 19 Sept 2026, according to the latest Polymarket betting data.
The shift in the implied resignation date comes as the probability of Starmer still being PM on 19 Sept 2026 is now estimated at ~86%, up from ~84% previously. Traders are now pricing in a higher chance Starmer will remain in office past the original 18 Sept 2026 deadline.