The Rules of the Supreme Court (Northern Ireland) (Revision) 1980

Joinder of parties

4.—(1) Subject to rule 5(1), two or more persons may be joined together in one action as plaintiffs or as defendants with the leave of the Court or where—

(a) if separate actions were brought by or against each of them, as the case may be, some common question of law or fact would arise in all the actions, and

(b) all rights to relief claimed in the action (whether they are joint, several or alternative) are in respect of or arise out of the same transactions or series of transactions.

(2) Where the plaintiff in any action claims any relief to which any other person is entitled jointly with him, all persons so entitled must, subject to the provisions of any statutory provision and unless the Court gives leave to the contrary, be parties to the action and any of them who does not consent to being joined as a plaintiff must, subject to any order made by the Court on an application for leave under this paragraph, be made a defendant.

This paragraph shall not apply to a probate action.