61. A person must not act as a member of the flight crew which must by or under this Order be carried in an aircraft registered in a country other than the United Kingdom unless—
(a)in the case of an aircraft flying for the purpose of commercial air transport, public transport or aerial work, that person is the holder of an appropriate licence granted or rendered valid under the law of the country in which the aircraft is registered or the State of the operator; or
(b)in the case of an aircraft on a private flight, that person is the holder of an appropriate licence granted or rendered valid under the law of the country in which the aircraft is registered or under this Order, and the CAA does not give a direction to the contrary.