9.—(1) During the case statement period, the parent may deliver to the Secretary of the Tribunal a written statement of his case, which may include the views of the child, and must submit all written evidence on which he intends to rely and which he has not already submitted.
(2) In exceptional circumstances the parent may amend the notice of appeal, deliver a supplementary statement of reasons for appealing or statement of case or amend a supplementary statement of reasons for appealing or statement of case, if permission is given by—
(a)the President; or
(b)the tribunal at a hearing.
(3) The parent shall deliver to the Secretary of the Tribunal a copy of every amendment and supplementary statement for which permission was given.
(4) If the President gives permission under paragraph (2)(a) he may extend the case statement period under regulation 60(1) or, if it has expired, grant such further period as he considers appropriate.
(5) Where the board has lost its entitlement to be represented at the hearing in accordance with regulation 15 or 35, the giving of permission under paragraph (2) shall restore such entitlement and, if necessary, the hearing shall be re-arranged or adjourned, so that the board can be represented.