21.—(1) The annual fee payable in respect of an adoption support agency that is not a small adoption support agency, is £1157.
(2) The annual fee payable in respect of a small adoption support agency is £612.
(3) The annual fee is payable—
(a)if the certificate was issued before 1st April 2015, on the anniversary of the date on which the certificate was issued;
(b)otherwise, on the date on which the certificate is issued, and thereafter on the anniversary of that date.