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