If in proceedings before an employment tribunal on a complaint of unfair dismissal either the employer or the complainant claims—
the employer or the complainant may request the tribunal to direct that the person who he claims exercised the pressure be joined or sisted as a party to the proceedings.
The request shall be granted if it is made before the hearing of the complaint begins, but may be refused after that time; and no such request may be made after the tribunal has made an award of compensation for unfair dismissal or an order for reinstatement or re-engagement.
Where a person has been so joined or sisted as a party to the proceedings and the tribunal—
the tribunal may order that the compensation shall be paid by that person instead of the employer, or partly by that person and partly by the employer, as the tribunal may consider just and equitable.