In any proceedings for an offence under this Act it shall, subject to subsection (2) of this section, be a defence for the person charged to prove—
If in any case the defence provided by the last foregoing subsection involves the allegation that the commission of the offence was due to the act or default of another person or to reliance on information supplied by another person, the person charged shall not, without leave of the court, be entitled to rely on that defence unless, within a period ending seven clear days before the hearing, he has served on the prosecutor a notice in writing giving such information identifying or assisting in the identification of that other person as was then in his possession.
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