(1) This rule has effect where the court is aware from information supplied by the garnishee or from any other source that someone other than the judgment debtor —
(a) is or claims to be entitled to the debt; or
(b) has or claims to have a charge or lien on it.
(2) In this rule, “lien” means a right to retain possession of goods to protect a debt.
(3) Where this rule has effect, the court may require the judgment creditor to serve notice of —
(a) any hearing fixed by the court; and
(b) the application for an attachment of debts order,
on any person who may have such an interest as is set out in paragraph (1).
(4) The notice must be served personally unless the person is a body corporate.
(5) Notice must also be served on the —
(a) garnishee; and
(b) judgment debtor.
(6) A notice under this rule must contain a warning to every person on whom it is served that, if that person does not attend court, the court may proceed to decide the issue in that person's absence.