19.—(1) The applicant must submit to the Secretary of the Tribunal, before the end of the case statement period—
(a)a case statement, and
(b)all other evidence to be relied on by the applicant which has not already been submitted.
(2) If the Tribunal has given permission, the applicant may—
(a)amend the notice of application,
(b)submit a supplementary statement of reasons in support of the application,
(c)amend a supplementary statement of reasons in support of the application,
(d)submit a supplementary case statement,
(e)amend a supplementary case statement.
(3) The applicant must submit to the Secretary of the Tribunal a copy of every amendment and supplementary statement for which permission has been given under paragraph (2) within the time period granted.
(4) Where permission is given under paragraph (2), the Tribunal may, if necessary, extend the case statement period, under rule 53 or, if it has expired, grant such further period as the Tribunal considers appropriate.
(5) If, at the time permission is given under paragraph (2), the Commissioner has lost the entitlement to attend or to be represented at the hearing, in accordance with rules 23, 25 or 33, the giving of permission restores that entitlement and, if necessary, the hearing, or the remainder of the hearing, may be postponed or adjourned, as appropriate, so that the Commissioner can be represented.