I studied distance learning from Bristol - passed module 1 exams and currently doing module 2.
I can personally recommend them - I consider myself less than intelligent and the notes/course was superb preperation for the exams - I got a late 80's% average.
Distance learning studying is hard work and I looked at OATS and Bristol before deciding - the course structure with Bristol is very good and you get helpful telephone support if needed.
E-mail me directly if you want any further info.
Mark