2.—(1) Subject to sub-paragraphs (2) and (3), all persons interested may appear at the inquiry either in person or by counsel, agent or solicitor.
(2) No person shall be entitled to be heard at the inquiry unless he has within one week from the last publication of the notice of the holding of the inquiry under paragraph 1 sent a notice in writing to the Department of his desire to be heard at the inquiry.
(3) The person holding the inquiry may refuse to hear any person if he is satisfied that the views of that person—
(a)are frivolous; or
(b)have been adequately stated by some other person.