Where a trial judge intends to rely on observations of a party's courtroom behaviour (outside the witness box) to assess credibility, the judge must disclose that intention to the parties before judgment so that the party has a reasonable opportunity to address the observations by interrogation, evidence or advocacy. The judge's silence after the issue is raised in addresses, followed by reliance on the observations in a reserved judgment, constitutes a denial of procedural fairness warranting a new trial. A party's counsel objecting to the use of courtroom observations does not constitute waiver of the procedural fairness point where the judge does not indicate an intention to rely on the observations.
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