My understanding is that however and whenever Starmer leaves Number 10, it will involve going to see the King and resigning, so this market is intended to cover things like Labour losing an election, Starmer fighting and losing a leadership challenge etc.

@JoshuaWilkes the only thing that has now occurred to me is if Starmer would be able to resign if he lost his seat

@JoshuaWilkes https://www.instituteforgovernment.org.uk/explainer/prime-minister-loses-seat-general-election

Seems quite clear that he would

Can anyone think of any other edge cases?

N/A if he dies.

Other or n/a if no resignation?

What happens if he is challenged, accepts the challenge and runs in a leadership election and loses? Does that count as a resignation, and what specific event in the process will count as the timing of the resignation?