Keep meaning to get myself a copy of the OSG, and someone's just offered me the 7th ed - that's the 7th edition of the guide to the 16th edition regs - all very confusing!
I believe the current OSG is the 8th edition: obviously it's best to have the most up to date version but given that all refer to the 16th edn of the regs, I'm wondering how much difference there is?
I gather the 17th edition of the regs is imminent so the current OSG won't be current long anyway I suppose?
David