Hi T-Key,
I'm not at Oxford but went there for a brush-up course in Perf. They run two week courses for about £200 (it was that much when I went, anyway). They also do a weekend type of thing. The course was great, just what I needed at the time. The instructor was great, and you get the Oxford notes (at least you do on the two week course). It's definitely worth a look, and there are a few good B+Bs about too.
Give 'em a buzz. It'll be worth it after you pass the exam.
