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With just over a month to go until the referendum on Britain's membership of the European Union, Remain has a four point lead over Leave. Remain has moved to its highest level since August 2015 (44%), and as the campaign heats up and EU referendum coverage, canvassing and leafleting increases the proportion who say they're unsure how they will vote (12%) has fallen to the lowest level on YouGov's records (since September 2010).
