I've been doing my ATPL exams from home with them. Everything has gone well, they've got they're own website questions and i've done two stages of the distance learning with all passes so far! Even POF (after some graft!)
The ground schools are really good before the exams, and any probs i had we're sorted there.
Havent seen the bristol question bank, I have been using the question bank i got with the CATS course.
I'd say, take your first exams and see how you get on!
I passed all of mine no probs so if it works why go the extra!?!
cheers
PlaneEasy7