56. Time within which appeal is to be preferred — (1) An appeal shall be preferred by the aggrieved person within a period of thirty days from the date of receipt of the order of the Approval Committee under rule 18.
(2) When the appeal is preferred after the expiry of the period of thirty days specified in sub-rule (1), it shall be accompanied by an application
supported by an affidavit setting forth the facts on which the appellant relies to satisfy the Board that he has sufficient cause for not preferring
the appeal within the said period of thirty days:
Provided that if the Board is satisfied that the appellant had sufficient cause for not preferring the appeal within the aforesaid period, it may for
reasons to be recorded in writing, admit the appeal after the expiry of the aforesaid period but before the expiry of forty-five days from the date
of communication to him of the order of the Approval Committee.