This seems like a big deal.

Boris Johnson will be dismissed by Queen if he tried to ignore court order to implement Benn Act, says Grieve

Dominic Grieve, one of the 21 Tories who had the whip removed after rebelling over Brexit last week and one of the MPs involved in drafting the Benn Act to rule out a no-deal Brexit on 31 October, has said that he thinks the legislation is robust, and that ministers will not find loopholes in it.

In an interview with Sky News, Grieve said that, if Boris Johnson tried to ignore the law, the courts could force him to comply.

[Johnson] would be taken to court and a writ of mandamus would be issued against him and he would be told, as a matter of law, that he has to write the letter [to the EU requesting a Brexit delay]. The case could go to the supreme court and I suspect the courts could do with it very quickly.

Grieve also said that, if Johnson tried to ignore the courts, ultimately he could be dismissed as PM by the Queen.