P
PlumbSafe
better with the bpec version and cheaper, also try treloars gas book
Treloars, Oh My God!!! that name and book brings back some memory's, I have not heard that name since my apprenticeship, great little plumbing book. as for the gas book I tend to find its always best to use whatever book your training center teaches from. so find that out and your half way there, I got the viper book and the center used a CITB binder thing, I had to buy that too just to know what everyone else was talking about, so don't waste your money, ps the vipper book is great, but in the field I only ever use the Corgi's gas essentals and gas rate pocket slide and gas safes pocket unsafe procedures book.