(1) A party to a proceeding may plead a matter that arose after the proceeding started.
(2) A party to a proceeding may plead facts giving rise to a cause of action that arose after the proceeding started only—
(a) if it is not unjust to any other party; and
(b) with the court's leave.
Note 1 See r 502 (3) (Amendment—of documents) about including a cause of action arising after a proceeding is started.
Note 2 See also r 104 (Ground of defence arising after defence filed etc), r 467 (Counterclaim—defence arising after answer) and r 481 (3) (Pleadings—after reply).
Note 3 Pt 6.2 (Applications in proceedings) applies to an application for leave.