17.—(1) After the completion of a tidal work the Company shall at the outer extremity thereof exhibit every night from sunset to sunrise such lights, if any, and take such other steps, if any, for the prevention of danger to navigation as Trinity House may from time to time direct.
(2) If the Company fails to comply with any requirement of a direction given under this article it shall be guilty of an offence and liable on summary conviction to a fine not exceeding the statutory maximum and on conviction on indictment to a fine.
Provided that it shall be a defence for the Company to prove that all due dilligence was used to secure compliance with any such direction.