Default of defence to counterclaim
8. A defendant who counterclaims against a plaintiff shall be treated for the purposes of rules 2 to 7 as if he were a plaintiff who had made against a defendant the claim made in the counterclaim and, accordingly, where the plaintiff or any other party against whom the counterclaim is made fails to serve a defence to counterclaim, those rules shall apply as if the counterclaim were a statement of claim, the defence to counterclaim a defence and the parties making the counterclaim and against whom it is made were plaintiffs and defendants respectively, and as if references to the period fixed by or under these Rules for service of the defence were references to the period so fixed for service of the defence to counterclaim.