The deadline for Prime Minister Keir Starmer to announce his resignation has shifted 3 days earlier, from 15 September 2026 to 12 September 2026, according to Polymarket data.
This change suggests the market expects Starmer's resignation to come sooner than previously anticipated, with the implied probability of him still being PM on 12 Sept now around ~86%.
The Prime Minister's office has not yet commented on the updated timeline.