The date by which Prime Minister Keir Starmer is expected to announce his resignation has been pushed back by 3 days, from 21 August 2026 to 24 August 2026, according to the latest Polymarket betting data.
The shift in the implied resignation date comes as the probability of Starmer remaining as PM on 24 August 2026 has increased to ~86%, up from ~80% previously. Traders are now pricing in a higher chance that the Labour leader will stay in office beyond the original 21 August deadline.