Would they kneel? Would anyone even say, "the Queen is dead, long live the King", or is that a made-up thing too? Is there a ring to hand over (I know, too many movies, right)?
I know, I'm writing the story, maybe I should make the whole thing up!
I've googled various variations of 'what would happen if Queen Elizabeth dies', but all I get is variations on the subject of William becoming King before Charles, which always makes me roll my eyes.
ETA: Problem solved! Thanks so much to everyone for your answers!