roydo
in memoriam - 1965-2024
That isn’t how it’s ever worked in the past - they (senior government figures and MPs) usually decide who will be PM very quickly and then that person goes to the Palace.
The idea of a “caretaker” PM isn’t one that has ever existed in our constitution, except when an already existing PM has announced they are stepping down but hold office until a successor can be elected by the party.
After all the people who get the office Deputy PM tend to be the ones who absolutely wouldn’t be the successor in the event of a sudden event - eg Prescott being deputy PM for Blair, or Clegg being deputy for Cameron, and now Raab.
If Johnson popped his clogs overnight would Raab be PM tomorrow morning? Almost certainly not, they’d just go with the one who was most able to get another government together.
But its zippo to do with the Queen. And Rabb would assume the office until the 1922 lot or the whips or whoever decide. But either way, the Tories would need a new party leader. Whoever that is would be PM until the next election.