Where any notification required by section 36(6), 37(6) or 39(2) of this Act to be served on a person by the Registrar is served on him by sending it by post then, on an application made at any time by that person, the member of the General Council appointed to act for the purposes of this paragraph, if satisfied that the notification was not received by that person within fourteen days of the giving of the decision to which the notification relates, may if he minks fit by authorisation in writing extend the time within which an appeal under section 40 of this Act may be brought against the decision.