I've spoken to several British people and asked them why they thought so many voted for Brexit when it was clear what it would mean economically (disaster) and they said there was a huge amount of deliberate disinformation or else lack of clear information about what it would mean.
It sounds like there was a right wing campaign for Brexit which was basically about getting rid of Europeans (immigrants) because of course they were the cause of Britain's woes.
Small sample of opinions, but fairly accurate, I suspect.