(1) These rules apply, with necessary changes, to the conduct and pleading of a counterclaim as if—
(a) the plaintiff on the counterclaim were the plaintiff in an original proceeding; and
(b) the defendant to the counterclaim were the defendant to the original proceeding; and
(c) the counterclaim were an originating process.
(2) However, if a party against whom a counterclaim is made has filed and served a notice of intention to respond or defence in accordance with part 2.3 (Notice of intention to respond and defence), the party is not required to file and serve a notice of intention to respond in relation to the counterclaim.
(3) Subject to rule 471 (Counterclaim—order for separate hearing), a counterclaim must be heard at the hearing of the plaintiff's claim.