I have long suspected that an act of Parliament would be necessary to formally trigger Article 50. In an 8-3 verdict today, the UK Supreme Court affirmed this suspicion. Theresa May cannot invoke royal prerogative for the simple reason that leaving the EU is an act that has a tremendous impact on laws governing the UK. And the Supreme Court says these vast changes in UK law require an act of Parliament to decide. At the same time, the Court ruled that Wales, Scotland and Northern Ireland have no devolved powers here, They cannot veto the UK’s exit from the EU.