16.—(1) The application of the seal of the Commissioners shall be authenticated by the signature of the chairman of the Commissioners or some other member authorised by the Commissioners to authenticate the application of the seal, and of the chief executive of the Commissioners or some person authorised by the Commissioners to act in his place in that behalf.
(2) The Commissioners may authorise a person to act instead of the chief executive under this paragraph whether or not the chief executive is absent or incapable of acting.
(3) Any notice, licence or other document given or issued by the Commissioners shall, unless the contrary intention is expressed, be sufficiently authorised if signed by the chief executive of the Commissioners or a duly authorised officer of the Commissioners.