Evidence at hearing
44.—(1) In the course of the hearing the parties shall be entitled to give evidence, to call witnesses, to question any witness and to address the tribunal both on the evidence, including the written evidence submitted before the hearing, and generally on the subject matter of the appeal or the claim:
Provided that neither party shall be entitled to call more than 2 witnesses in the case of an appeal or 5 witnesses in the case of a claim to give evidence orally (in addition to any witness whose attendance is required pursuant to paragraph (2)) unless the President, or the tribunal at a hearing gives permission.
(2) Evidence before the tribunal may be given orally or by written statement, but the tribunal may at any stage of the proceedings require the personal attendance of any maker of any written statement:
Provided that a party shall not be entitled to give evidence by written statement if such evidence is submitted with the notice of appeal or claim or the statement of his case or in accordance with a direction under regulation 33.
(3) The tribunal may receive evidence of any fact which appears to the tribunal to be relevant.
(4) The tribunal may require any witness to give evidence on oath or affirmation, and for that purpose there may be administered an oath or affirmation in due form, or may require any evidence given by written statement to be given by affidavit.