Could It Be Illegal

Guardian UK: Forget the politics – Brexit may be unlawful - Panic not: there are good reasons to believe the government’s decision to withdraw from the EU would not be legal, and that the UK is not going anywhere

For this reason, the courts are particularly firm in keeping public authorities within the limits of their powers. UK withdrawal from the EU would affect the legal situation of every person in the UK, and the legal situation of many other people elsewhere.