Something else.But to gain Leave voters, Farage, Johnson and the rest promised deals, Norway style, Canada Style, The easiest deal ever, the EU needs us more than we need them... etc., etc., etc.,
Another aspect of the Brexit vote similar to the presidential race in the USA was the degree to which polls influenced behavior.
Clinton was heavily favored, as was Remain. As a result, lots of people didn't bother voting believing that the rest of the electorate would see to it that good sense reigned.
Both were very low turnout referendums. OOPS! A major take away lesson is "Don't assume that other people will handle your responsibility to vote, do it yourself."
Tom