The court requires the parties to litigation to bring all their claims forward at the same time. The court will not, except in special circumstances, allow the same parties to open the same subject of litigation in respect of a matter which might have been brought in the first action, but was not brought forward or was omitted through negligence, inadvertence or accident. Res judicata applies not only to issues that were before the court, but also to issues which properly belonged to the subject of the litigation and which the parties could have brought forward: Henderson v. Henderson (1843), 67 All E.R. 313.
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