79.—(1) In proceedings for an offence under the provisions of this Order mentioned in paragraph (2) it shall be a defence for the Borough to prove that it took all reasonable precautions and exercised all due diligence to avoid the commission of the offence.
(2) The provisions referred to in paragraph (1) are the following—
article 18; and
article 20.
(3) If in any case the defence provided under paragraph (1) involves the allegation that the commission of the offence was due to the act or default of another person, the Borough shall not, without leave of the court, be entitled to rely on that defence unless, not less than 7 clear days before the hearing, it has served on the prosecutor a notice in writing giving such information as was then in its possession, identifying or assisting in the identification of, that other person.