7.—(1) Where any relevant food authority becomes aware that a charge is due to it under these Regulations it must—
(a)calculate the amount of the charge having regard to the information in its possession; and
(b)give notice of the amount so calculated to any person from whom it may be collected.
(2) If the relevant food authority or competent authority is satisfied that a calculation made under paragraph (1) is incorrect, it must recalculate the charge and—
(a)where the correct amount is more than the amount calculated under paragraph (1), recover the higher amount in accordance with that paragraph;
(b)where the correct amount is less than the amount calculated under that paragraph and that amount has not been recovered, it may only recover the lesser amount in accordance with that paragraph; and
(c)where no charge is payable or the charge payable is less than the amount calculated under that paragraph, and that amount has been recovered, it must repay the difference.