13E+W+SWhere—
(a)any sum was deposited with the Corporation by way of security under any provision of the 1972 Act; and
(b)on and after the appointed day that sum is treated by the Corporation as deposited under any provision of this Act,
any period beginning three months or less before that day, being a period during which the sum was deposited with the Corporation, shall be treated for the purposes of the payment of interest on that sum as a period during which the sum was deposited under that provision of this Act.