In proceedings for an offence under any provision of this Act mentioned in subsection (2) below it shall be a defence for the Company to prove that they took all reasonable precautions and exercised all due diligence to avoid the commission of the offence.

The provisions referred to in subsection (1) above are the following:—

• section 18 (Lights on tidal works during construction);

• section 19 (Provision against danger to navigation);

• section 22 (Permanent lights on tidal works).

If in any case the defence provided under subsection (1) above involves the allegation that the commission of the offence was due to the act or default of another person, the Company shall not, without leave of the court, be entitled to rely on that defence unless, not less than 7 clear days before the hearing, they have served on the prosecutor a notice in writing giving such information as was then in their possession, identifying, or assisting in the identification of, that other person.