Thanks for the info David and the book arrived this morning along with a free copy of Dive ... great service from BSAC book shop
Only had a quick skim through but it was enough to get me all excited about me hols again
After chatting to a non-diving friend last night who said the very idea of breathing under water made him gag I got him to wear a mask and breathe from my regs on the settee .. what a picture. He loved it.
As I've now made a personal ambition to get him diving I'm already planning stage two. A snorkle in the bath I perhaps?