Keir Starmer's resignation as Prime Minister is now expected on 18 September 2026, three days earlier than the previous date of 21 September 2026. The change in the anticipated exit date comes amid growing pressure on the Labour leader.
Polymarket traders are now pricing in an ~86% chance that Starmer will have stepped down as PM by the new 18 September deadline, up from ~79% previously. The shift in the expected resignation date reflects the rapidly evolving political landscape surrounding the Prime Minister.