Regulation 5 Operating licences
Where the CAA has reason to believe that an aircraft is intended to be used by an undertaking without an operating licence that is required by and granted in accordance with the Council Regulation, the CAA may—
(a)
give to the person appearing to it to be in command of the aircraft a direction that he shall not permit the aircraft to take off until it has informed him that the direction is cancelled,
(b)
whether or not it has given such a direction, detain the aircraft until it is satisfied that the aircraft will not be so used,
and a person who, without reasonable excuse, fails to comply with a direction given to him in pursuance of this regulation shall be guilty of an offence.