Vegan +388% Vegetarian +136% Fish 'n' chips +1% Vegans are 1.16% of the UK population
You don't have to be vegan to eat vegan food.
Even if only a small percentage of people are vegans, you only need one vegan in a group of people to pick a place that offers vegan food. Vegan food is also a safe bet for the larger group of vegetarians. That means more places want to offer some good vegan options, which in turn makes more people try vegan food, and makes it easier to be a vegan.
I’m not a vegan nor a vegetarian, but I often find myself ordering vegan dishes because they seem more healthy for myself and the environment. There are so many types of food these days where vegan is not a compromise.