The Prime Minister's resignation date has been brought forward by 3 days, from 25 September 2026 to 22 September 2026, according to the latest Polymarket betting data.
The shift in the implied resignation date suggests growing market uncertainty over Keir Starmer's future as Labour leader and PM. The ~86% probability that Starmer will step down by the new 22 September date underscores the fragility of his position.