Thanks for that link Ian, will read and digest.
I read you weren't racing this weekend and he has a football match next weekend (if the snow clears) so we might well pop down on the 12th and watch some racing to see how things are done.
I'm quite looking forward to it too and he is already bugging me for some tools and a toolbox. He is still oblivious to the fact that I have the car and it was good for him to hear people recommending the 2nd hand B4's. Kids being kids he wouldn't have taken my word for it but he heard the people who know say it
See you then!