BOAC,
Hopefully an enlightened management will realise that FNC is a complete
anomaly and let you off setting off warnings like that.
Nigel,
I fully agree with what you are saying however there is the short term issue here that if ATC ask you to do 160 to 4 there are very few circumstances in which you can not do it, and if you can not then you must tell ATC.
Then there is the long term issue about setting the correct procedures with ATC talking to operators to resolve this in the most efficient way possible.