8.—(1) Compensation payable under this Part carries interest at the rate for the time being prescribed under section 32 of the Land Compensation Act 1961 from the date specified in sub-paragraph (2) to payment.
(2) The date is—
(a)in the case of compensation payable under paragraph 3(1)(a) or (b), the date of depreciation;
(b)in the case of compensation payable under paragraph 3(1)(c), (d) or (e), the date on which the loss is sustained, the damage is done, or the injurious affection occurs, as the case may be;
(c)in the case of compensation payable under paragraph 6(6), the date on which the expenses become payable.
(3) If it appears to a person (“A”) that A may become liable to pay to another person (“B”) compensation under this Schedule or interest under this paragraph, on the written request of B, A may make one or more payments on account of such compensation or interest.
(4) A may recover the payment or excess if, after A makes a payment under sub-paragraph (3)—
(a)it is agreed or determined that A is not liable to pay compensation or interest, or
(b)by reason of any agreement or determination, the payment is shown to be excessive.