Dave,
There are two parts to it; Theory(exam) and practical, you either buy the book and study for the exam yourself and then do the practical or you do a classroom theory course prior to sitting the exam and then do the practical.
The cost is around £210 for the full wammy but it can be cheaper if you study yourself.
you will need to speak to Paul Fowler to get more details and to confirm these prices though.
I am definatly going to do it as I feel it would be a benifit for the future.
Tom