Don't worry about paying me for postage.. I can see what I can try and send through work without them getting suspicious!
It can take some time to try and work out the best diet for a kitty, especially when you want the best for their health, so anything I can do to make that easier and I'll gladly try! If you would like me to send a couple of cans to try, then PM me your address and I'll get them in the post. Take care.