The plaintiff is correct in my view in arguing that the defendant's argument is also met in this case by the principle enunciated in Henderson v. Henderson (1843) [1843-60] All E.R. Rep. 378 that the plea of res judicata applies not only to points actually decided on the merits, but "to every point which properly belonged to the subject of litigation and which the parties, exercising reasonable diligence, might have brought forward at the time".
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