With my lot, I never have a problem getting over £19 on Zooplus!!!
I swear by Royal Canin (Not just cos I'm a nurse, however). Tried mine on James Wellbeloved and Arden Grange, and there was always some left in their bowls. As I have ten cats, and because the royal canin ain't cheap (thank goodness I get discount!), I mix it with whiskas dry to bulk it out, but it is still mostly Royal Canin, and they all love it. My older girl, Nina (approx 13) had pre-renal blood results, but after a few months of the Mature Royal Canin, her bloods are all normal again! (I know your's is just a baby, though!) I would always say to clients that come into the vets 'go for the best you can afford', and never (I know I should) push food products on them.
Dry diet it good! My lot all get three meals a day, only having 2 sachets of wet on their tea between ten of them!
LIz