A judge's courtroom observations of a party's demeanour may be relied upon in judgment where the observations were volunteered during addresses and the opposing party's counsel was invited to take them into account, giving the affected party a reasonable opportunity to respond. The requirement to disclose observations is flexible and based on commonsense, and the availability of re-opening to lead evidence may satisfy procedural fairness requirements. The weight given to conflicting medical evidence in the exercise of a discretion is seldom House v The King error.
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