ANO 2016
Operation of radio in aircraft
79.—(1) A radio station in an aircraft must not be operated, whether or not the aircraft is in flight, except—
(a)in accordance with the conditions of the licence issued for that station under the law of the country in which the aircraft is registered or the State of the operator; and
(b)by a person duly licensed or otherwise permitted to operate the radio station under that law.
So, there you have it. Somewhere in the depths of small print engineers must be 'permitted'.
Clear as mud, I know.