16.—(1) Where a certificate is amended so as to reduce or restrict the amount of legal aid payable under it or is discharged or revoked, that amendment, discharge or revocation shall not affect the payment, or the amount of the payment, out of the Fund to the solicitor of the person in relation to whom the certificate was issued in respect of costs incurred before the date on which notice of the amendment, discharge or revocation is received by that solicitor.
(2) Where a certificate has been amended or discharged with effect from a date earlier than the date on which notice of the amendment or discharge is received by the solicitor of the person to whom the certificate was issued, that person shall pay into the Fund the amount of any legal aid paid or payable to his solicitor by virtue of paragraph (1) in respect of costs incurred between those dates.
(3) Where a certificate has been revoked, the person to whom it was issued shall pay into the Fund the amount of any legal aid paid or payable to his solicitor by virtue of paragraph (1) in respect of costs incurred before the date on which notice of the revocation is received by that solicitor.