At the beginning of the hearing the chairman shall explain the order of proceeding which the tribunal proposes to adopt.

The tribunal shall conduct the hearing in such manner as it considers most suitable to the clarification of the issues and generally to the just handling of the proceedings; it shall, so far as appears to it appropriate, seek to avoid formality in its proceedings.

The tribunal shall determine the order in which the parties are heard and the issues determined.

The tribunal may, if it is satisfied that it is just and reasonable to do so, permit a party to rely on grounds not stated in his notice of appeal or, as the case may be, his reply or response and to adduce any evidence not presented to the board before or at the time it took the disputed decision.

If at or after the commencement of any hearing a member of the tribunal other than the chairman is absent, the hearing may, with the consent of the parties, be conducted by the other two members and in that event the tribunal shall be deemed to be properly constituted and the decision of the tribunal shall be taken by those two members.