Without looking into the detail i think its essentially who has the aurhority to act on behalf of the UK in order to enact article 50 , representing UK on an international level . Since the power to enact the article has not been delegated to a government office , such as foreign office or similar , then my understanding is that it rests with Parliament . I deal with EuropeanUK law a fair bit but not anything like the UK unwritten constitution so that is just my two cents . Edit The point i was trying to make here and missed was that the decision on who can enact article 50 is a UK law question . <| sep |> Wenn alle Schler fleiig werden und sich mit ihrem Stoff beschftigen knnte man mehr machen . Denkste aber mal an jedes Abitur zurck biste doch froh , wenn die Leute die Hlfte von dem bisschen Kram behalten haben , den man ihnen erzhlt hat .