26.—(1) A person who does not fall within regulation 25(1) or (2) may apply to the Director asking him to withdraw or vary a decision (“the relevant decision”) falling within paragraphs (a) to (f) of regulation 25.
(2) The application must—
(a)be made in writing, within such period as is specified in the rules in Schedule 1; and
(b)give the applicant’s reasons for considering that the relevant decision should be withdrawn or (as the case may be) varied.
(3) If the Director decides—
(a)that the applicant does not have a sufficient interest in the relevant decision,
(b)that, in the case of an applicant claiming to represent persons who have such an interest, the applicant does not represent such persons, or
(c)that the persons represented by the applicant do not have such an interest,
he must notify the applicant of his decision.
(4) If the Director, having considered the application, decides that it does not show sufficient reason why he should withdraw or vary the relevant decision, he must notify the applicant of his decision.
(5) Otherwise, the Director must deal with the application in accordance with the rules in Schedule 1.
(6) The applicant may appeal to the tribunal against a decision of the Director notified under paragraph (3) or (4).
(7) The making of an application does not suspend the effect of the relevant decision.