Boca's your basic soyburger. Quorn does one that is mycoprotein, but tastes similar, or Sainsbury's (I would think most supermarkets actually) do their own brand of soyburger. Most supermarkets will carry frozen veggie burgers like Grassingtons (with broccoli, carrots, peppers, and beans in them) or a bean-type patty. Quorn also does a nice breaded "chicken" burger. I like veggie burgers better than meat ones personally, and I'm not a vegetarian.