I wouldn't have thought there was much more light to shed than you already have!
Bristol requires two-week brush-up courses plus the exam days after that. Will your employer let you have two lots of three weeks off work?
Do you need a formal structure in order to motivate your self-study? Or are you a self-starter?
You can still subscribe to the Bristol Question Bank whichever school you decide upon.
Cheers
Whirls