A £991 Polymarket bet suggests there is an ~81% chance that Prime Minister Keir Starmer will announce his resignation from Downing Street by December 31, according to the market's implied probability.
The large trade, placed by the user 'Monthly-Task', closed a position backing Starmer's departure by the end of the year. The Polymarket market currently indicates around an 81% likelihood that the Prime Minister will step down before January 1.