[highball]

The UK’s monarch also can withhold said assent, equivalent to a presidential veto; this is one of the monarch’s reserve powers.

Technically, perhaps. But not in practice.

To do so would create a constitutional crisis, end the monarchy and tear apart the government. Which makes it utterly unlike a presidential veto.

I don't like this either, but it's not on the Queen's head. It's on the head of the PM and all the MPs who voted for it.

[Olog-hai]

Withholding of royal assent is not an automatic trigger of a new election; but in this case, this government would deserve it, I have to say.

Current practice is not precedent, neither is it law; the reserve powers are the law.