When after Royal Canin vet diet, i found Nutrecare to be the cheapest supplier and note that they are also cheaper for James Wellbeloved, compared to Pets at Home store prices. However, unless you are buying over £40 in value, postage charges cancel any savings. Pets at Home seems the best option. If you ask nicely, they'll give you a free sample. Wainwright's, actually a Pets at Home, own premium brand, is very similar ain content and quite a bit cheaper. They do salmon, duck and turkey varieties.
Barbara, Monty, Joly and Teddy.