The date by which Prime Minister Keir Starmer is expected to resign has been pushed back by 2 days, according to the latest Polymarket data. The previous resignation date of 10 September 2026 has now shifted to 12 September 2026.
This change in the implied resignation date comes as the political situation around Starmer's leadership continues to evolve. The ~86% probability that Starmer will step down by the new 12 September 2026 date suggests the market sees this as an increasingly likely outcome.