Thesandbox,
The Bristol GS notes and CBT are great, and if you've got those you'll quite happily be able to pass the exams without the brush up courses, although I'd seriously recommend that you part with an extra £50 and purchase access to their online questionbank. About 95-99% of the questions that appear in the exams are in their database, so it makes the exams very easy. In terms of time, I did the whole course and all the exams in 3 months - not something I'd care to repeat anytime soon, but it is possible if you're motivated.
PM me if you want more details.
SBW