Oh, so that's how this "responsible government" thingee works, huh?

U.K. Voters’ Frustration High as 99% Are Sidelined in Prime Minister Election

A small slice of party members within each party chooses that party's leader.

That leader is the person who will be PM, head the government, if the party is called upon to form a government.

That happens if the party has or gains a majority, or leads a coalition making up a majority in the Parliament.

The Tories have since since the parliamentary election of 2017 led a coalition majority with the Democratic Unionist Party (DUP) of Northern Ireland, and that has not changed just because Theresa May has resigned her post as Tory party leader and so as PM.

There isn't going to be another parliamentary election until 2022 unless an early election motion [is] passed by a super-majority of two-thirds in the House of Commons or a vote of no confidence in the government is passed which is not followed by a vote of confidence within 14 days.

The replacement of May involves only the party choosing for itself a replacement in the role of party leader, a replacement who, given the situation, will step into the role of PM of the UK.

Looks like it's going to be Boris Johnson, and it looks like he's going for a no-deal Brexit.

Something only a smallish minority of Brit voters actually want, though a majority of Conservatives support it.