We believe that vegans should support vegan businesses first, rather than support businesses that happen to offer something “vegan”, or are so called “vegan-friendly”, where you money will actually be going to support “carnism”. The choices we make when we spend our money is a powerful tool for change. ”Vegan-friendly” businesses that also sell animal-derived products want it both ways – they are happy to support the slaughter and abuse of animals but also want your vegan-pound; while pure vegan businesses are often struggling when their (small) target market shifts to support omnivorous businesses.

See article and list here:
http://veganomics.com/guides/vegan-eating-in-london