Section 2 of the Vexatious Proceedings Act 1956

2.––(1)(b) If, on an application made by any person against whom legal proceedings have been instituted by any other person or who has reason to believe that the institution of legal proceedings against him is contemplated by any other person, the court is satisfied that the said person has persistently and without any reasonable ground instituted legal proceedings in any court or in any inferior court, whether against the same person or against different persons, the court may, after hearing that other person or giving him an opportunity of being heard, order that no legal proceedings shall be instituted by him against any person in any court or any inferior court without the leave of that court, or any judge thereof, or that inferior court, as the case may be, and such leave shall not be granted unless the court or judge or the inferior court, as the case may be, is satisfied that the proceedings are not an abuse of the process of the court and that there is prima facie ground for the prceedings.

(1)(c) An order under paragraph (a) or (b) may be issued for an indefinite period or for such period as the court may determine, and the court may at any time, on good cause shown, rescind or vary any order so issued.

4) Any person against whom an order has been made under subsection (1) who institutes any legal proceedings against any person in any court or any inferior court without the leave of that court or a judge thereof or that inferior court, shall be guilty of contempt of court and be liable upon conviction to a fine not exceeding one hundred pounds or to imprisonment for a period not exceeding six months.