79The directors may exercise all the powers of the company to borrow money, and to mortgage or charge its undertaking, property and uncalled capital, or any part thereof, and to issue debentures, debenture stock, and other securities whether outright or as security for any debt, liability or obligation of the company or of any third party:
Provided that the amount for the time being remaining undischarged of moneys borrowed or secured by the directors as aforesaid (apart from temporary loans obtained from the company's bankers in the ordinary course of business) shall not at any time, without the previous sanction of the company in general meeting, exceed the nominal amount of the share capital of the company for the time being issued, but nevertheless no lender or other person dealing with the company shall be concerned to see or inquire whether this limit is observed. No debt incurred or security given in excess of such limit shall be invalid or ineffectual except in the case of express notice to the lender or the recipient of the security at the time when the debt was incurred or security given that the limit hereby imposed had been or was thereby exceeded.