(1) An “ancillary claim” is any claim other than a claim by a claimant against a defendant, a counterclaim or a claim for a set off contained in a defence and includes a —
(a) claim by a defendant against any person (whether or not already a party) for contribution or indemnity or some other remedy; and
(b) claim by an ancillary defendant against any other person (whether or not already a party).
(2) In this Part —
“ancillary claimant” means a person who makes an ancillary claim; and
“ancillary defendant” means the defendant to that claim.
(3) If an ancillary defendant makes an ancillary claim against a further person that person is to be called the “second (or as the case may be) ancillary defendant”.