County Court Rules (Northern Ireland) 1981

Generally

1.  Save as otherwise provided in this Order the plaintiff may unite in the same action several causes of action and—

(a) claims by or against husband and wife may be joined with claims by or against either of them separately;

(b) claims by or against an executor or administrator as such may be joined with claims by or against him personally, provided the last-mentioned claims are alleged to arise with reference to the estate in respect of which the plaintiff or defendant sues or is sued as executor or administrator;

(c) claims by plaintiffs jointly may be joined with claims by them or any of them separately against the same defendant.