"Is it not also an offence to obey an illegal order ? I seem to recall that this was so in English Common Law long before the Nuremburg trials made it explicit."
Yes, but you may well get the comment in your ACR "...is overly rule-bound" after asking your Boss (politely) to switch off his non-authorised personal laptop during flight! (the more immediate response was to tell me to "f*** O**").