38.—(1) A person shall be disqualified from participating as a member in the hearing or determination of, or acting as clerk or officer of a tribunal in relation to–
(a)an appeal against a completion notice if he is a member of the relevant authority concerned; or
(b)an appeal under regulation 12, 28 or 30 if he is a member of the special authority concerned.
(2) References in this regulation to the relevant authority concerned and to the special authority concerned are references to the relevant authority and the special authority in whose area is situated the hereditament which is the subject of the appeal.