Rule 44 of The Probate and Administration Rules: Revocation or annulment of grant

(1) Where any person interested in the estate of the deceased seeks pursuant to the provisions of section 76 of the Act to have a grant revoked or annulled he shall, save where the court otherwise directs, apply to the High Court for such relief by summons in Form 107 and, where the grant was issued through the High Court, such application shall be made through the registry to which and in the cause in which the grant was issued or, where the grant was issued by a resident magistrate, through the High Court registry situated nearest to that resident magistrate’s registry.
(2) There shall be filed with the summons an affidavit of the applicant in Form 14 for revocation or annulment identifying the cause and the grant and containing the following particulars so far as they are known to him—
(a) whether the applicant seeks to have the grant revoked or annulled and the grounds and facts upon which the application is based; and
(b) the extent to which the estate of the deceased has been or is believed to have been administered or to remain unadministered, together with any other material information.
(3) The summons and affidavit shall without delay be placed by the registrar before the High Court on notice in Form 70 to the applicant for the giving of directions as to what persons (if any) shall be served by the applicant with a copy of the summons and affidavit and as to the manner of effecting service; and the applicant, upon the giving of directions, shall serve each of the persons so directed to be served with a notice in Form 68, and every person so served may file an affidavit stating whether he supports or opposes the application and his grounds therefor.
(4) When the persons (if any) so directed to be served (or such of them as the applicant has been able to serve) have been served with a copy of the proceedings, the matter shall be placed before the High Court on notice by the court to the applicant and to every person so served, and the court may either proceed to determine the application or make such other order as it sees fit.
(5) Where the High Court requires that notice shall be given to any person of its intention of its own motion to revoke or annual a grant on any of the grounds set out in section 76 of the Act the notice shall be in Form 69 and shall be served on such persons as the court may direct.