Re: Well that ruling has a timespan of about 30 days in the UK
VoNC (or resignation) passes PMship to whomsoever can command confidence. So the new PM goes to the Queen the same day, and the request is sent the EU.
A general election is the backstop if nobody can win a VoC in 14 days. Only question is whether it's Corbyn or not.
Civil Contingencies Act, Government is immediately taken to court, loses case and is held in contempt of Parliament. Boris (and his team) may also be tried for treason, due to obviously premeditated illegal acts in direct contravention of the clear expressed will of Parliament.
Meanwhile, a VoNC has taken place and a new PM has been installed, who sends the request.
In any event another likely possibility is that the Queen dismisses Boris for refusing to comply with the law, and asks Parliament to recommend a new PM, who sends the request. There's been several hints that she's considering this.
The PM doesn't get to ignore the law. No matter how high you are, the law is above you.