Williams v Public Trustee of New South Wales

The case of Williams v Public Trustee of New South Wales was heard in the Supreme Court of New South Wales. The dispute involved the admissibility of an expert witness's report in a litigation context. The plaintiff, Williams, sought to challenge the Public Trustee of New South Wales over certain estate matters, and the defendant relied on an expert report in their defence. The core issue before the court was whether the report was admissible given that not all documents referred to in the report were identified or disclosed to the plaintiff prior to the expert being called.

The legal issues revolved around the rules of evidence concerning expert reports, particularly the requirement for full and frank disclosure of the materials upon which an expert's opinion is based. The court had to determine whether the failure to identify all documents used by the expert in forming their opinion resulted in unfair prejudice to the plaintiff, thereby making the report inadmissible. The court also considered whether there were any mitigating factors, such as the possibility of remedying the prejudice through an adjournment or other measures.

The Supreme Court found that the failure to disclose all documents used by the expert did result in unfair prejudice to the plaintiff. The court reasoned that the expert's report was not sufficiently identified to the other party, which was a breach of the duty to fully and fairly disclose materials upon which an expert relies. The court emphasised that such a breach could undermine the fairness of the proceedings and the reliability of the expert's evidence. Consequently, the report was deemed inadmissible, and the court instructed the parties to take steps to ensure that all relevant documents are properly identified and disclosed in the future.