Losing the referendum was a bitter blow to Remainers, with 17.4 million people defying their pleas, threats and entreaties by voting Leave.

As a result, many Remainers have decided to cope with the Brexit vote by working hard to delegitimise it. They argue that these Leave voters "didn't know what they were voting for", an argument made by politicians of every party stripe (and even Sir Elton John).

Their hope is that by making out that the Brexit vote only happened because voters were led astray by the Leave campaign, a case would be made for another referendum. Of course they tend to add, with a self-satisfied air, that this one would be a referendum "on the facts".

But how firm a grasp did voters have on what they were voting for? Fresh polling by Deltapoll shows that the lion's share of Leave voters (80 per cent) had an understanding of the implications of Brexit.