Parliament is sovereign and, if Brexit wins, Cameron will not be legally obliged to invoke the Lisbon treaty to start an EU exit
The simple answer to the question as to whether the EU referendum is legally binding is “no”. In theory, in the event of a vote to leave the EU, David Cameron, who opposes Brexit, could decide to ignore the will of the people and put the question to MPs banking on a majority deciding to remain.
This is because parliament is sovereign and referendums are generally not binding in the UK.
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