I moved mine off kitten stuff after they were neutered. If you want kitten goodness, how about a compromise, with kitten kibble and normal wet food? Incredibly cheap wet at the moment is Tesco Just Nature, 60% meat (lamb or turkey) for 22p. It was 52p for months now just 22p for some reason.

Tesco Luxury is also very good quality (50% meat)

Tesco Just Nature Cat Pate Turkey & Rice (100g) Price Comparison | mySupermarket

I think Hi-Life is dead reasonable. Asda do the Tuna and Chicken varieties for about £4 for a box of 12 pounches. It's 60% meat content and is widely available in most supermarkets.

my advise is dnt over buy if your introducin new food.
due to threads on here i changed sheldon from felix to high life and he wudnt eat it he ended up goin without food for a full day. so i ended up waistin a full pack. i then changed to natures menu which got the same reaction.
so i have opped back to felix and to substitute the lack of meat im givin him raw few times a week

good luck