If you look on zooplus website the phosphorus content is given for quite a few of their foods (although you will have to work out the content on a dry matter basis) and there are lots of grain free wet foods that have a low phosphorus content (porta 21, Terra Faelis, Feringa to name 3) but I'm not sure about dry foods as I only fed wet to my cat with renal failure. There is some controversy about whether low protein is necessary or desirable for cats with kidney failure, especially if it is in the early stages. If your cat has early stage renal failure I would be inclined to feed a good quality grain free food (eg Thrive, Applaws) rather than an actual renal dry food but that's a personal decision and it does depend on various factors including how far advanced the disease is. Does your cat eat any wet food at all? As I'm sure you know, dehydration can be a big problem in cats with renal failure and wet food is the best way of getting water into them so if you can get him to eat any wet food at all that would probably help
Do you know about Tanya's crf site? There are lists of canned and dry foods with the nutritional info, including phosphorus content, listed.
http://www.felinecrf.org/canned_food_uk.htmhttp://www.felinecrf.org/dry_food_uk.htmHope that helps.
