Supreme Court Rules 1987

(1) A person shall not be added as a plaintiff without his consent signified in writing or in such other manner as the Court orders.

(2) An application by a person for an order adding him as a party shall, unless the Court otherwise orders, be supported by an affidavit showing his interest in the questions in the proceeding or the question to be determined as between him and a party to the proceeding.

(3) Without limiting rule

9.06(b), where a person not a party to a proceeding for the recovery of land is in possession by himself or by a tenant of the whole or a

part of the land, the Court may order that he be added as a defendant.