Question to the Foreign, Commonwealth & Development Office:

To ask Her Majesty’s Government what assessment they have made of whether a member state can withdraw from the EU under (1) a Treaty agreed to under the ordinary revision procedure pursuant to Article 48 of the Treaty on European Union, or (2) under Article 54(b) of the Vienna Convention on the Law of Treaties.

As the Government noted in its publication “The process for withdrawing from the European Union” (Command Paper 9216), the rules for exit are set out in Article 50 of the Treaty on European Union. This is the only route available in the EU Treaties to withdraw from the EU.