According to this movie, the mastermind behind the UK’s historic referendum was Dominic Cummings (Benedict Cumberbatch). He apparently pretty much single-handedly strategised and architected the Leave campaign with razor sharp focus on simple messages. Take Back Control: use the money we pay every week to Brussels (£350m) for the NHS instead, and keep immigrants out. In short form: £350m and Turkey.
There is a healthy sub-genre of British Cinema that celebrates the quirkiness of the Brits, their subcultures and their local communities. Combine that with a backdrop of economic hardship, an abundance of prejudice, and a dash of politics and you get a very funny movie like Pride.