I was passing Cheddar a couple of weeks ago and dropped in to Bristol GS to ask them for info on their course. I found them very helpful. I was able to look through their notes for as long as needed and even had a brief chat with Alex who kindly took the time to talk to me at some length. Even had the opportunity to talk to some of the students. All in all I was very impressed.
So I'd definitely recommend taking NB's advice and paying them a visit.
Haven't signed up yet. Waiting for the class 1 before commiting any funds.
Al