Joining of additional parties
7.—(1) If it appears to a Tribunal, whether on the application of a party or otherwise, that it is desirable that any person other than the Revenue be made a party to any proceedings, the Tribunal may order such person to be joined as a party in the proceedings and may give such directions for giving effect to, or in connection with, the order as it thinks fit.
(2) Where pursuant to an order under paragraph (1) above a person is joined as a party in any proceedings by reason of a question arising in those proceedings which may affect his liability to tax or in which he otherwise has an interest, he shall not be entitled, unless all the other parties consent, to be present at the hearing of the proceedings except during such part of the hearing as relates to that question, and a Tribunal shall, if necessary, hear any such question separately from the rest of the proceedings.
(3) On the application of a person who has been joined as a party in the circumstances specified in paragraph (2) above, a Tribunal may, if it is satisfied that it would be to the convenience of the parties to do so, transfer the proceedings to the General Commissioners for the division in which the applicant ordinarily resided at the date of the application, or to the Special Commissioners.