4Where any complaint is required to be determined by an Independent Schools Tribunal the tribunal shall consist of the sheriff (or, if he is unable to act, a person qualified for appointment as sheriff nominated by the Lord President of the Court of Session), who shall be chairman, and two other members appointed from the educational panel by the Secretary of State, of whom at least one shall be a woman in the case of a complaint concerning a school for girls or a complaint concerning the proprietor of a school, or a teacher therein, who is a woman.