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Summary: EU withdrawal is being seriously discussed for the first time in a generation. But how would it work? In a programme previously broadcast on 16 November 2009, Analysis looks at the Lisbon Treaty, which contains a clause setting out an exit process. But, as Chris Bowlby reports, the final deal between Britain and its former EU partners would depend a lot on the mood of their "divorce" - amicable or acrimonious. We hope you enjoy this programme - which we offer you while Analysis is off air.