art 5 Addition and substitution of parties
(1) If it appears to the Registrar, whether on the application of a party or otherwise, that it is desirable that any person be made a party to the proceedings, the Registrar may direct that such person be added as a new party and may give consequential directions, including directions as to the delivery and service of documents. (2) The Registrar may direct that any person cease to be a party if it is not desirable for that person to be a party to the proceedings. (3) The Registrar may direct that a new party be substituted for an existing one if the existing party’s interest or liability has passed to the new party and it is desirable to substitute the new party so that the Registrar can resolve the matters in dispute in the proceedings.