Keir Starmer is expected to resign before the end of this month. New elections should happen any day now.
The first happening doesn't imply that the second will, in a Parliamentary Democracy
Let me explain ... unlike in the US, in a Parliamentary Democracy, it's the
party that "holds power" ... so in every UK riding at election time, voters elect a Member of Parliament; the party with the most MP's becomes the Government, and the
leader of that Party becomes the Prime Minister.
In 2024,
Labour got 411 of the 650 seats in the UK Parliament, a clear majority.
SO, even if Starmer resigns as PM, he's still an MP and Labour is
still the Government ... they just have an internal vote among their MP's to see who the new leader will be, and the winner becomes PM
automatically,
without a General Election where the voters have a say.
(* Same thing happened in Canada last spring, that's how Carney got in as PM without any election)