8.  Rule 21 shall stand as paragraph (1) of that rule and the following paragraph shall be inserted after paragraph (1)—

“(2) Where an appeal has been determined under paragraph (1)(d) and the appellant applies to the President, without undue delay, for the decision to be set aside, the President may, if after affording each party a reasonable opportunity to make representations he considers that the interests of justice so require, grant the application and arrange for the appeal to be re-heard before a differently constituted tribunal; and he may make such further order as he thinks fit.”