I agree it's a growing trend and I, personally, am happy that folks are embracing a healthier lifestyle.
However, Vegans in the UK (last count, 600,000) represent 0.9% of the population. Strict Hindus represent about 1.5%. 6.7% of the population is Muslim. Jews, 0.46%. Coeliacs represent about 1%. Should restaurants provide options for all these groups?
I'm not being bloody-minded or trying to pick a fight; on the contrary, I'd love to see everyone accommodated when they go out to eat. However, as I stated above, restaurants are businesses and they need to ensure their offerings cover their financial needs AND make a profit.
My experience over the past 18 months in the UK was encouraging, I think, because most places had a couple of vegetarian options and even Vegan options. My nephew is not only "vegetarian", he's also a Chef's nightmare : eats cheese, but not blue, eats vegetables, but not cabbage, mushrooms or sweet corn, etc, etc., and we went to several places where he was happy with the food.
Absolutely, but half the population is over 40 and a good percentage of that, over 55. They want their fish & chips, Sunday Roast, pies and Ham, eggs, spam, curry & chips. And they want British food. That's going to change, obviously, but at the moment, restaurateurs will continue to offer what SELLS.