'Fraid although it seems like a good price, I wouldnt touch it, esp not with a young cat - I wouldnt even use Sainsbury's with a young cat though, as things are so expensive - an MRI done through the specialist my vet uses would cost you £2k, and that is purely for that, it doesn't take into account anything done before or after, so your £4k wouldnt' go far in that kind of situation.