If any person requests an officer or a person appointed by the Commissioners to transact any business relating to an assigned matter with him on behalf of another person, the officer or person so appointed may refuse to transact that business with him unless written authority from that other person is produced in such form as the Commissioners may direct.

Subject to subsection (1) above, anything required by the Customs and Excise Acts 1979 to be done by the importer or exporter of any goods may, except where the Commissioners otherwise require, be done on his behalf by an agent.