13.—(1) Where—N.I.
(a)any sum was deposited with Northern Ireland Electricity by way of security under any provision of the 1972 Order; and
(b)on and after the day appointed for the coming into operation of any provision of Part II of this Order that sum is treated by the appropriate successor company as deposited under that provision of that Part,
any period beginning 6 months or less before that day, being a period during which the sum was deposited with Northern Ireland Electricity, 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 that Part.
(2) In this paragraph “successor company” has the same meaning as in Part III of this Order.