I hardly ever watch ITV (not snob but advert-averse), but I've just watched a devastating piece of investigative journalism called Exposure: Brexit Online Uncovered. When you consider that a one percent swing in the referendum would have given remain a victory, (Steve Shaw)

According to most sources the result of the referendum was 51.89% Leave, 48.11% Remain.
A 'one percent swing' would make it 50.89% Leave, 49.11% Remain.
Perhaps our resident ex-teacher needs to work a little harder on his maths.