The date by which Prime Minister Keir Starmer is expected to resign has shifted forward by 17 days, according to the latest Polymarket data. Starmer's resignation is now anticipated by 21 September 2026, rather than the previous date of 8 October 2026.
The change reflects a shift in market sentiment, with traders now pricing in an earlier exit for the Labour leader. The new ~86% implied probability suggests Starmer will step down as PM within the next 12 months.
The Prime Minister's office has not commented on the updated resignation timeline.