Thanks everyone! I've got some books I was following on the correct percentage of each type of ingredient (along with some recipes) so I think I'll pull it out and start doing it again. I'll just lie to my vet, can't be bothered getting into it. Yeah, I know they recommend some pretty crappy food from the vets. The cats never like it.
PS:"would it be good for humans to eat from a cat every day with fully nutritional complete meals?" That was supposed to be CAN (typo) but I think everyone figured that out.