Lili Winter
A well known health foods brand
I went to the store in West Orchards in Coventry because that's where I lived, but you can see from the website that they have shops all over England. It's a haven for fans of healthy food and vegetarians / vegans. You can find vitamins, seeds, soy milk, rice milk, vegetarian sausage meat (Linda McCartney, Quorn, etc). The prices are quite low, too.