reg 43 Defence of due diligence
(1) Subject to the following provisions of this regulation, if proceedings are brought against a person (“P”) for an offence under these Regulations it is a defence for P to show that P took all reasonable steps and exercised all due diligence to avoid committing the offence. (2) Where P's defence involves an allegation that the commission of the offence was due to— (a) the act or default of another; or (b) reliance on information given by another, P is not, without the leave of the court, entitled to rely on the defence unless, within a period ending 7 clear days before the commencement of the hearing of the proceedings (or in Scotland, the trial diet), P has served a notice under paragraph (3) on the person bringing the proceedings. (3) A notice under this paragraph must give such information identifying, or assisting in the identification of, the person who committed the act or default or gave the information as is in the possession of P serving the notice at the time it is served. (4) P is not entitled to rely on the defence provided by paragraph (1) by reason P's reliance on information supplied by another, unless P shows that it was reasonable in all the circumstances to have relied on the information, having regard in particular— (a) to the steps which P took, and those which might reasonably have been taken, for the purpose of verifying the information; and (b) to whether P had any reason to disbelieve the information.