I've had mixed reports from Derek whoever-it-is (Davidson?) in Bournemouth. A couple of people thought he was great. Another said it's basically a crammer, and although he'll get you through the exams, you will have to do some reading by yourself if you're to know the stuff you really need when you get your PPL. But he seems to get people through the exams anyway, which is what you wanted to know. He advertises in most of the flying mags.