I did CATS at Luton, and have no complaints.
But, when you're working out costs, don't forget to factor on the additional costs for accommodation on your brush-ups.
My course cost £1600 (online DL +books)
Plus £1000 over the three weeks brush-up and three exam weeks for accommodation.
Plus £1000 (roughly) for all the exam fees.
I chose CATS in part because of the lower course fee than most, and in part because their 3 section syllabus suited my leave process from work (didn't need to take more than 2 weeks off at a time to do brush-up and exams).
What I am saying to you is to factor in the additional travel / accommodation expenses into your coatings, since you are in the enviable position of having another reputable school on your doorstep. The difference in cost might not be so bad, and IMO both schools generally receive good feedback.