Supreme Court Rules 2000

The Court or a judge may appoint one or more persons to represent any person or class of persons, including an unborn person, who is or may be interested in or affected by a proceeding if – the person or class or a member of the class cannot be readily ascertained; or the person or class or a member of the class cannot be found; or the contingent right of any unborn person may be affected by the proceeding and it is desirable to have the proceeding determined before the person is born; or it is expedient in all the circumstances, including the amount involved and the degree of difficulty of the point to be determined, to make the appointment for the purpose of saving expense.

A judgment or order binds any person or class represented by another person appointed under subrule (1) as if the person or each member of that class were parties.