1(1)The base period for the purposes of section 134 of this Act (“the principal section”) is the last quarter of 1980; and the average chargeable deposits held by a person in that period shall be determined by—U.K.
(a)aggregating the chargeable deposits held by him at the close of a business on 15th October, 19th November and 10th December 1980; and
(b)dividing the result by three.
(2)Where a person regularly prepares statistics of the deposits held by him as at the close of business on a particular day in each month and the day in October, November or December 1980 is not that mentioned in sub-paragraph (1)(a) above, the Board may, on the application of that person, direct that for any of those days there shall be substituted the day in the month in question for which that person has prepared the statistics.
(3)Any time at which the amount of the chargeable deposits held by a person falls to be ascertained by virtue of this paragraph is in this Schedule referred to as a material time.