hi,
I had a look at the oxford school a few months back at their open day. I must admit that I was impressed, but having not seen any other schools I cant compare it. It is more expensive than other schools but you see where the money goes. The school itself has top of the range facilities and equipment. I have never been to CCAT but it would be worth having a look at oxford and ccat, comparing them to see exactly where your money goes in both of them. The difference could well be worth it, then again it may not be.
Oxford also has a great name, its regarded by the industry as being top in the UK. They have the reputation of being a top class school so that may favour you when looking for a job.