20.—(1) An appeal against a decision with immediate effect shall be heard and determined not later than thirty-five working days after the date on which the notice of appeal is received by the Secretariat, unless the appointed person decides in the interests of justice that the expedited procedure in this regulation shall not apply.
(2) Where the expedited procedure applies, the appointed person shall determine the applicable procedure and time limits.
(3) The appointed person may vary the expedited procedure determined under paragraph (2) at any time if he considers there are reasonable grounds to do so.
(4) The appointed person shall promptly notify each party of the applicable procedure to be followed and of any subsequent variation.