Berkeley Challenge Pty Ltd v Potbury

Berkeley Challenge Pty Ltd (the appellant) appealed to the New South Wales Court of Appeal against a decision of the Supreme Court of New South Wales. The dispute concerned the appellant's entitlement to recover certain payments made to the respondents, who were former employees of the appellant. The appellant sought to recover these payments on the basis that they were made under a mistake of fact, specifically that the appellant believed it was legally obliged to make them when it was not.

The primary legal issue before the Court of Appeal was whether the payments made by the appellant to the respondents were recoverable as money paid under a mistake of fact. This required the court to consider the nature of the mistake alleged by the appellant and whether it satisfied the legal requirements for recovery in equity and at common law. The court also had to determine if any defences, such as change of position, were available to the respondents.

The Court of Appeal held that the appellant was not entitled to recover the payments. The court reasoned that the appellant's belief that it was legally obliged to make the payments was not a mistake of fact in the relevant sense. Instead, it was a mistake as to the legal effect of certain agreements and the appellant's legal obligations arising from them. The court affirmed the principle that a mistake as to the law, even if fundamental, is generally not a ground for recovery of money paid under it. Furthermore, the court found that even if there had been a mistake of fact, the respondents had acted to their detriment in reliance on the payments, establishing a defence of change of position.

Consequently, the appeal was dismissed, and the decision of the Supreme Court was affirmed.