Not sure if this has been brought up but there was serious flooding throughout the UK and especially the London area yesterday. I wonder if this may have kept many of the less-motivated “STAY” voters at home.
It’s possible as some areas of London were under a couple of feet of water and it is a solid IN area. He also had to suspend all campaigning for a few days when Jo Cox MP was murdered and the Labour Party leader made a very poor attempt to persuade Labour voters to “Remain”. It was bad luck for David Cameron all round really!