21.—(1) Any provision of this Order which prohibits the doing of a thing except under the authority of any licence or with any permission shall not have effect in relation to any such thing done anywhere other than in the Bailiwick of Guernsey or, as the case may be, the Bailiwick of Jersey, provided that it is duly authorised.
(2) A thing is duly authorised for the purpose of paragraph (1) above if it is done under the authority of a licence or with permission granted, in accordance with any law in force in the place where it is done (being a law substantially corresponding to the relevant provisions of this Order), by the authority competent in that behalf under that law.