6(1)Where the Development Corporation are guilty of an offence under paragraph 1 or 4 above they shall be liable—U.K.
(a)on summary conviction, to a fine not exceeding the statutory maximum, and
(b)on conviction on indictment, to a fine.
(2)In proceedings for any such offence it shall be a defence for the Development Corporation to show that they 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) above involves the allegation that the commission of the offence was due to the act or default of another person, the Development Corporation shall not, without the leave of the court, be entitled to rely on the defence unless, not later than seven clear days before the hearing of the proceedings, they have served on the prosecution a notice in writing giving such information as was then in their possession identifying or assisting in the identification of the other person.