21.—(1) On receipt of the records and the grounds for the decision of the Personnel Board concerned, the President of the Commission shall, subject to paragraph 22, convene a meeting of the Commission to consider the appeal.
(2) The Commission shall decide an appeal solely on the merits of the case.
(3) Before making any decision on the appeal, the Commission may —
(a)
seek advice on any matter arising out of the appeal; and
(b)
call to its presence any person who in its opinion is able to give further evidence.
(4) After considering the appeal, the Commission may confirm or vary the decision of the Personnel Board concerned.