8(1)Subject to sub-paragraph (4) below, where—
(a)the Commissioners make an assessment under paragraph 2 or 3 above of an amount of aggregates levy due from any person for any accounting period and notify it to him,
(b)the assessment is made after a return for the purposes of any regulations under section 25 has been made by that person for that accounting period, and
(c)the assessment is made on the basis that the amount (“the additional amount”) is due from him in addition to any amount shown in the return, or in a previous assessment made in relation to the accounting period,
the additional amount shall carry interest for the period specified in sub-paragraph (2) below.
(2)That period is the period which—
(a)begins with the day after that on which the person is required in accordance with regulations under section 25 of this Act to pay aggregates levy due from him for the accounting period in question; and
(b)ends with the day before the day on which the additional amount is paid.
(3)Interest under this paragraph—
(a)in respect of so much of the period specified in sub-paragraph (2) above as falls before the day on which the assessment is notified to the person in question, shall be payable at the rate applicable under section 197 of the Finance Act 1996 (c. 8); and
(b)in respect of the remainder (if any) of that period, shall be penalty interest.
(4)Where—
(a)the Commissioners make an assessment under paragraph 2 or 3 above of an amount of aggregates levy due from any person for any accounting period and notify it to him,
(b)they also specify a date for the purposes of this sub-paragraph, and
(c)the amount assessed is paid on or before that date,
the only interest carried by that amount under this paragraph shall be interest, at the rate given by sub-paragraph (3)(a) above, for the period before the day on which the assessment is notified.