I'm encountering the same problem; my cat has just been diagnosed diabetic and I want to get her away from regular wet/dry food onto a totally wet diet with very high meat content. She has to have the pate/mousse kind as she struggles with chunks (although she likes them). I was leaning more towards Nature's Menu or Nature's Harvest until I saw the good deal on the Asda food, but I'd read that meats like chicken, turkey and rabbit were better for cats in general than fish (or beef/lamb)... I suppose if she mostly had one of the Nature diets as her main meal and then the Asda tuna food every now and then it would make the more expensive stuff go further!