Starmer out by...?

This market will resolve to “Yes” if Keir Starmer ceases to be the Prime Minister of the United Kingdom for any period of time on and before the specified date, 11:59 PM ET. Otherwise, this market will resolve to “No”. An announcement of Keir Starmer's resignation/removal before this market's end date will immediately resolve this market to "Yes", regardless of when the announced resignation/removal goes into effect. The resolution source for this market will be the government of the UK, however a consensus of credible reporting will also suffice.