Change of authorised representative may be effected by memorandum, endorsement, or Vakalatnama; tribunal need not insist on no objection. Change of authorised representative may be effected after filing by memorandum to the tribunal, endorsement, Vakalatnama, or other document of authorisation; upon such communication the bench will not normally insist on a no objection certificate from the previous authorised representative, though it may require one in particular cases at its discretion.