"That there will be a referendum in Britain is hardly a surprise. Since 2011, EU referendums have been entrenched in Britain's fragile constitution.
"Nor is the timetable new. The constitutional Convention cannot start until spring 2015. The Convention will be followed by an intergovernmental conference. Then national ratification procedures will start across the EU. Several countries will have a referendum. All have to agree.
"What matters is the nature of the package deal to be reached in those negotiations. The British problem will only form relatively minor part of that negotiation.
"The primary purpose of the Convention will be to install a federal economic government of a fiscal union. It is that federal treaty on which the UK people will be asked to vote not the current state of play.
"The EU which comes out of the present crisis will be very much more integrated than it is now. This gives British political parties a chance to come out in favour of a strong united democratic Europe providing stability and prosperity at home and leadership for peace and justice in world affairs.
"Mr Cameron will now have to learn how the European Union works. In particular, if he wants to recast existing EU laws he needs to win the support of MEPs. So far his attitude to the European Parliament has been marked more by contempt than by respect.
"Lastly, the prime minister is also deeply deluded if he thinks that a referendum will settle the European debate for all time. It won't."
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The Union of European Federalists (UEF), is a supranational political movement founded in 1947 dedicated to uniting Europe along federal lines. Andrew Duff MEP (Lib Dem/UK) is President of the Union of European Federalists (UEF) and spokesman on constitutional affairs for the Alliance of Liberals and Democrats for Europe (ALDE). He co-chairs the Spinelli Federalist Intergroup in the European Parliament.