4Subject to the provisions of section 1 of the [1946 c. 58.] Borrowing (Control and Guarantees) Act 1946 and of any order under that section for the time being in force, the Society may borrow for the purposes of the fund from any lender and may charge any investments of the fund by way of security for any such loan; but the aggregate sum owing at any one time in respect of such loans shall not exceed £100,000.