30.—(1) Where a person has a right of complaint against a prospective employer and against an employment agency arising out of the same facts, he may present a complaint against either of them or against them jointly.
(2) If a complaint is brought against one only, he or the complainant may request the tribunal to join the other as a party to the proceedings.
(3) The request shall be granted if it is made before the hearing of the complaint begins, but may be refused if it is made after that time; and no such request may be made after the tribunal has made its decision as to whether the complaint is well-founded.
(4) Where a complaint is brought against an employer and an employment agency jointly, or where it is brought against one and the other is joined as a party to the proceedings, and the tribunal—
(a)finds that the complaint is well-founded as against the employer and the agency, and
(b)makes an award of compensation,
it may order that the compensation shall be paid by the one or the other, or partly by one and partly by the other, as the tribunal may consider just and equitable in the circumstances.