11.—(1) After the completion of a relevant work the Council shall at the outer extremity thereof exhibit every night from sunset to sunrise such lights, if any, and take such other steps for the prevention of danger to navigation as Trinity House shall from time to time direct.
(2) If the Council fail to comply in any respect with a direction given under this article, they shall be 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 Council to prove that all due diligence was used to secure compliance with any such direction.