6.—(1) Where a person to whom notice of an oral hearing by a tribunal has been given wishes to apply for that hearing to be postponed, he shall do so in writing to the clerk to the tribunal stating his reasons for the application, and the clerk may grant or refuse the application as he thinks fit or may pass the application to the chairman, who may grant or refuse the application as he thinks fit.
(2) The chairman or the clerk to the tribunal may of his own motion at any time before the beginning of an oral hearing postpone that hearing.
(3) An oral hearing may be adjourned by the tribunal at any time on the application of any party to the proceedings or of its own motion.
(4) Where an oral hearing is adjourned and at the hearing after the adjournment the tribunal is differently constituted, the proceedings at that hearing shall be by way of a complete rehearing of the case.