The Rules of the Supreme Court (Northern Ireland) (Revision) 1980

Offer of contribution

10.  If, at any time after he has entered an appearance, a party to an action who, either as a third party or as one of two or more tortfeasors liable in respect of the same damage, stands to be held liable in the action to another party to contribute towards any debt or damages which may be recovered against that other party in the action, makes (without prejudice to his defence) a written offer to that other party to contribute a specified amount or to a specified extent to the debt or damages, then, notwithstanding that he reserves the right to bring the offer to the attention of the judge at the trial, the offer shall not be brought to the attention of the judge until after all questions of liability and amount of debt or damages have been decided.