[Defletter]

> Elections really do happen in the UK and really do determine who is Prime Minister.

Different person, but while this is true, it's also true that the Prime Minister is not elected: they [ordinarily] emerge as being the leader of whichever party commands a majority in Parliament. It's how we've had so much Prime-Minister turnover since the Brexit referendum: those didn't happen because the electorate "determined" it.

[foldr]

Yes sure, it’s a simplification to say that elections always directly determine who the Prime Minister is, and I probably should have been clearer on that point. However, this difference between a parliamentary system and a presidential one has nothing to do with rogue Kings going mad with power.