The Nr Fairy
My concern was with your last bit.
"However the "ways and means" act of getting around this is may be to offer to provide the specimen but only in a private place - that way, there is no refusal."
It could be considered a refuasl by putting that condition on providing it.
I would agree that it would be better to do so out of sight of the pax, or indeed other staff, but there is no compulsion to do so. I just wanted to ensure that no one misunderstands, they can ask, but if its refused, thats that, the test is still not optional, unless someone wants to get arrested.