4.—(1) Where DLRL is guilty of an offence under paragraphs 2 or 3 above it shall be liable on summary conviction to a fine not exceeding level 3 on the standard scale.E+W
(2) In proceedings for any such offence it shall be a defence for DLRL to show that it took all reasonable precautions and exercised all due diligence to avoid the commission of the offence.
(3) If in any case the defence provided by sub-paragraph (2) involves the allegation that the commission of the offence was due to the act or default of another person, DLRL shall not, without the leave of the court, be entitled to rely on the defence unless, not later than 7 days before the hearing of the proceedings, it has served on the prosecution a notice in writing giving such information as was then in its possession identifying or assisting in the identification of the other person.