Bristol.
Is definitely the best distance learning course you could hope to sign up to.
I personally didn't sign up but a good friend of mine did and he was extremely pleased with the CD's content, good moving pictures with explanations etc.
The response time between Bristol and himself was close to instantaneous when it came to questions and answers/explanations.
Also I would say, if it comes to reviewing your subject for an interview with an airline that those notes maybe very useful.