thank you for your replies
Fred is at the vets now. Ginger seems so lost without him and the house feels empty (which is odd, as there are still 2 cats here). I sat down all sad after he had gone and both Benji and Ginger sat on my lap together and we all fell asleep! it was lovely as Benji does not normally sit on laps and Ginger does not normally sit with Benji (he insists on washing her and it makes her grumpy, lol) so that made me smile.
My fiance will be picking Fred up at about 6 tonight after work, annoyingly I am going to work soon and working until 7.30 which means it will be ages until I see my little man, but it does mean I will be kept busy.
Sorry I didn't mean badly bred in that way, just that the breeders hadn't tested the parent cats for it and so ended up passing it onto the kittens? but it seems to be a recent thing doing the testing?
did they go on kidney food for it, does that help in these cases?
He just seems so young (just turned 1) and if he is already showing symptoms...
anyway, fingers crossed it is something else, a tube in the wrong place or something that can be easily solved.