19.—(1) The application of the seal of the Authority shall be authenticated by the signature of the convener of the Authority or some other member authorised by the Authority to authenticate the application of the seal, and of the Chief Executive of the Authority or some person authorised by the Authority to act in his place in that behalf.
(2) The Authority 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 Authority shall, unless the contrary intention is expressed, be sufficiently authorised if signed by the Chief Executive or a duly authorised officer of the Authority.