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How could a new referendum on Britain's relationship with Europe work? As pressure mounts on Theresa May to seal an agreement on Brexit, there are growing calls for a further referendum on the issue. From across the political spectrum, MPs, trade unions and campaigners are demanding another vote on the terms of the deal, or lack of one. In the Briefing Room, David Aaronovitch examines the mechanics of this hypothetical proposition. What would the procedure be to trigger another referendum and how would it be organised? And is there enough time?\nGuests: \nChris Morris, BBC Reality Check \nAlan Renwick, deputy director of the Constitution Unit, University College London\nProfessor Catherine Barnard, Senior Fellow at the UK in a Changing Europe Initiative at King\u2019s College London\nProfessor Matt Qvortrup of Coventry University \nKatya Adler, BBC Europe Editor