Paragraph 20.6 Defendant’s additional claim for contribution or indemnity from another party
(1)
A defendant who has filed an acknowledgment of service or a defence may make an additional claim for contribution or indemnity against a person who is already a party to the proceedings by—
(a)
filing a notice containing a statement of the nature and grounds of his additional claim; and
(b)
serving the notice on that party.
(2)
A defendant may file and serve a notice under this rule—
(a)
without the court’s permission, if he files and serves it—
(i)
with his defence; or
(ii)
if his additional claim for contribution or indemnity is against a party added to the claim later, within 28 days after that party files his defence; or
(b)
at any other time with the court’s permission.