Watch out for that assumption. I believe at the end of 2015, a few months before the Brexit referendum, about 70% of people were indicating they'd vote remain

Watch out for that assumption. I believe at the end of 2015, a few months before the Brexit referendum, about 70% of people were indicating they'd vote remain in polls. That's the only reason Cameron and the rest of the Remain-supporting political class allowed a referendum at all: they were sure they were going to win. Turns out that intense discussion, debate and political campaigning can change voter's minds. That's the point of it in fact. Who knew?