Originally Posted by
Crash one
I still don't think the question has been answered correctly here.
It's a bit like that Air Law or IR(R) question: "is the legal visibility in [such and such circumstances] 1500m or 1800m?".
The correct answer is: "WGAS? - if it's less than 5k I'm not going flying anyway".
Similarly the answer to questions about legal requirements for passenger briefing is: "WGAS? - I'm doing it anyway, whether or not it's a legal requirement".