Keir Starmer's expected resignation date as Prime Minister has been brought forward by 5 days, according to the latest Polymarket data. The new anticipated resignation date is now 26 August 2026, down from the previous 31 August 2026.
The shift in the implied resignation timeline suggests growing market uncertainty around Starmer's future as PM. The change implies an ~86% chance of his resignation being announced by the new 26 August date.