The possibility of Britain leaving the EU is very real, according to opinion polls, with an in/out referendum expected in June, though the regional administrations are asking for September because of their own elections in May. With the Prime Minister committed to campaigning for staying in, there will be no work done in advance to present what withdrawal will look like. If it is a no vote, there will be a period of two years for negotiation of the exit process and what new arrangement with the remaining EU 27, as laid out in Article 50 of the founding treaty of Rome.