17.—(1) If, at any stage of a hearing or inquiry, the appointed person considers that any of the reasons referred to in paragraph (2) apply, the appointed person may prevent any person from—
(a)giving evidence,
(b)cross-examining a person giving evidence, or
(c)presenting any matter.
(2) The reasons are—
(a)that the evidence or matter was not provided within the relevant time limits;
(b)that the evidence or matter was otherwise not provided in accordance with any provision of these Regulations or with any direction given or requirement made by the appointed person under these Regulations;
(c)that the evidence or matter is irrelevant or repetitious; or
(d)that the person is behaving or has behaved in a disruptive manner at the hearing or inquiry.
(3) Without prejudice to the powers in paragraph (1), if any person at the hearing or inquiry behaves in a disruptive manner the appointed person may—
(a)require that person to leave;
(b)prevent that person from participating in the hearing or inquiry; or
(c)permit that person to remain at, or participate in, the hearing or inquiry only on specified conditions.
(4) Where the appointed person refuses to permit a person to give oral evidence under paragraph (3), the person may submit to the appointed person any evidence or other matter in writing before the close of the hearing or inquiry (but this is subject to paragraph (1)).