The Prime Minister's resignation date has been brought forward by 3 days, according to the latest Polymarket betting data. Keir Starmer is now expected to step down as PM on 16 September 2026, rather than the previous date of 19 September.
The shift in the implied resignation date suggests increased market confidence that Starmer will depart Downing Street earlier than previously anticipated. The betting odds currently imply an ~86% chance Starmer will have resigned by the new 16 September deadline.