13.—(1) A compensator who makes a compensation payment calculated in accordance with regulation 12 must inform the person to whom the payment is made—
(a)that the payment has been so calculated; and
(b)of the date for payment by reference to which the calculation has been made.
(2) If the amount of a compensation payment calculated in accordance with regulation 12 is nil, a compensator giving a statement saying so is to be treated for the purposes of these Regulations as making a payment within regulation 4(1)(a) on the day on which the statement is given.
(3) Where a compensator—
(a)makes a compensation payment calculated in accordance with regulation 12; and
(b)if the amount of the compensation payment so calculated is nil, gives a statement saying so,
the compensator is to be treated, for the purpose of determining any rights and liabilities in respect of contribution or indemnity, as having paid the gross amount of the compensation payment.
(4) For the purposes of these Regulations—
(a)the gross amount of the compensation payment is the amount of the compensation payment apart from regulation 12; and
(b)the amount of any recoverable lump sum payment is the amount determined in accordance with the certificate.