Judgments of the UK Supreme Court do bind the executive, though - so if they uphold the High Court judgment then the government needs to go to Parliament. In t

Judgments of the UK Supreme Court do bind the executive, though - so if they uphold the High Court judgment then the government needs to go to Parliament. In the event that they overturn the High Court judgment, you're right that Parliament could in principle pass an Act reserving to itself the right to activate Article 50. In practice, though, the government would use its majority in the Commons to stop that happening. Or alternatively send in the Article 50 notification while Parliament is debating the bill. In either case, the Supreme Court's judgment would be effectively final.