(1) A defendant who has filed an acknowledgment of service or a defence may make an ancillary claim for contribution or indemnity against another defendant by —
(a) filing a notice containing a statement of the nature and grounds of the claim; and
(b) serving the notice on the other defendants.
(2) Rule 18.4 does not apply to an ancillary claim under this rule.
• Part 9 deals with filing an acknowledgment of service.
• Part 10 deals with filing a defence.