Just because no court has yet done it doesn't mean it won't happen. I think the biggest underreported story is how the entire British system of government just kind of makes the rules up as it goes. If the Brexiteers were smart, they would next demand a written constitution.
Part of the problem here is the Cameron-enacted Fixed Term Parliament Act. In the old days, if the government lost a majority of Parliament, a vote of no confidence and new elections were a matter of course. Now, the government and the Parliament majority are at loggerheads, and an election is being vetoed by the Parliamentary majority, which is a very unusual situation in their Parliamentary system (not of course for us with a Presidential constitutional system).
” If the Brexiteers were smart, they would next demand a written constitution.”
Absolutely not. I don’t want to live under a constitution written by the jokers in our political class right now. It wouldn’t resemble anything like the US one and would embed a load of progressive lefty crap that could then never be undone by a conservative government.