PM Starmer's resignation date slips by 2 days to 20 Aug 2026

· implied p50 shift

Briefing

The date by which Prime Minister Keir Starmer is expected to resign has been pushed back by 2 days to 20 August 2026, according to the latest betting markets on Polymarket.

The shift comes as traders adjust their expectations for Starmer's future, with the implied probability of him remaining PM on that date now standing at ~86%.

Starmer has faced growing pressure from within his own party, with a number of Labour MPs publicly calling for him to step down in recent weeks.