(1) Subject to the following paragraphs of this regulation—
(a) in the case of any sum for injury to feelings, interest shall be for the period beginning on the date of the act of discrimination complained of and ending on the day of calculation;
(b) in the case of all other sums of compensation (other than any sum referred to in regulation 5), interest shall be for the period beginning on the mid-point date and ending on the day of calculation.
(2) Where any payment has been made before the day of calculation to the complainant by or on behalf of the respondent in respect of the subject matter of the award, interest in respect of that part of the award covered by the payment shall be calculated as if the references in paragraph (1), and in the definition of “mid-point date” in regulation 4, to the day of calculation were to the date on which the payment was made.
(3) Where the tribunal is of the opinion that—
(a) there are exceptional circumstances, whether relating to the case as a whole or to a particular sum in an award, and
(b) those circumstances have the effect that serious injustice would be caused if interest were to be awarded in respect of the period or periods in paragraphs (1) or (2),
it may—
(i) calculate interest, or as the case may be interest on the particular sum, for such different period, or
(ii) calculate interest for such different periods in respect of various sums in the award,
as it considers appropriate in the circumstances, having regard to the provisions of these Regulations.