volver
I'm not sure I'm with you on that varian. The PM is meant to be a first among equals (to quote a certain novelist) but since Blair they have started to behave like presidents. Now we get people saying they are voting for Boris when they are doing no such thing. The Tories can can choose who they like to lead the party, and they can change who that is any time they like.
But volver you have the advantage of living in Scotland where the electoral system for the Scottish Parliament is more, (although not perfectly) proportional.
The UK parliament is elected by a minority of voters giving an obscene majority of MPs and they impose whatever they like on us, and whoever they chose as their leader until the next election.
None of this would ever happen in a democratic country.