30.—(1) The administrator must record in the registry the expiry of a CRTS allowance, including a CRTS allowance which has been traded in accordance with article 25, which is—
(a)surrendered by a CRTS participant in accordance with article 27;
(b)not surrendered by a CRTS participant for—
(i)the scheme year for which it was allocated;
(ii)any of the three subsequent scheme years; or
(iii)a scheme year earlier than the scheme year for which it was due to be allocated, in accordance with article 15 (borrowing CRTS allowances);
(c)not surrendered by a former CRTS participant in accordance with article 29(5)(a); or
(d)converted into CCTS allowances in accordance with article 35.
(2) The administrator must record in the registry the expiry of a CRTS credit, including a CRTS credit which has been traded in accordance with article 25 or 26, which is—
(a)surrendered by a CRTS participant in accordance with article 27; or
(b)not surrendered by a CRTS participant for the scheme year for which the credit was acquired.