15.—(1) Where the court under section 8 of the Act postpones the determination of the application for an adoption order and makes an interim order in accordance with that section, the interim order shall be in Form 256 and the forms and duration of the order specified under subsection (1) of that section shall be fully set out in the order.
(2) The petitioner shall, not less than twenty-one days before the expiration of the period specified in the interim order, or such extended period as the court may in special circumstances allow, serve on the guardian ad litem and such other person or persons (if any) as the court may direct, an application for the final determination of his petition for an adoption order or for the discharge of the interim order, as the case may be, and not less than seven days before the day appointed for the hearing of the application file a copy thereof with the chief clerk together with the affidavit of such service in accordance with Rule 26.
(3) An application for the final determination of a petition for an adoption order referred to in paragraph (2) shall be in Form 257 and an application for the discharge of the interim order shall be in Form 258.
(4) An application by a guardian ad litem under section 8(6) of the Act for the final determination of the petition for an adoption order shall be in Form 259 and the guardian ad litem shall, not less than twenty-one days before the day appointed for the hearing of the application, serve such application on the petitioner and on such other persons, if any, as the court may direct and not less than seven days before that day file a copy thereof with the chief clerk together with the affidavit of such service in accordance with Rule 26.
(5) The provisions of Rules 12 and 13 shall apply to an application for the final determination of a petition for an adoption order or for the discharge of an interim order in accordance with this Rule.
(6) An order discharging an interim order shall be in Form 260.