27. Where the determination of an application is postponed and an interim order made-
(a) the applicant shall, at least two months before the expiration of the period specified in the interim order, apply to the Court by which the order was made to proceed to the final determination of the application;
(b) the Registrar shall thereupon fix a time for the further hearing of the application, and shall serve on every person served with a notice under Rule 14 a notice in Form 8.
28. If no such application as is mentioned in paragraph (a) of Rule 27 is made within the time required by that paragraph, an application for the purposes of that rule may be made at any time thereafter by the guardian ad litem or any person served with a notice under Rule 14 and the provisions of Rule 27 shall have effect accordingly.