Expense Reduction Analysts Group Pty Ltd v Armstrong Strategic Management and Marketing Pty Ltd

In Expense Reduction Analysts Group Pty Ltd v Armstrong Strategic Management and Marketing Pty Ltd, the High Court of Australia considered an appeal from the Court of Appeal of the Supreme Court of New South Wales concerning the inadvertent disclosure of documents subject to client legal privilege during discovery in a commercial dispute. The appellants, Expense Reduction Analysts Group Pty Ltd and others, had mistakenly listed privileged documents as non-privileged in their Lists of Documents, leading to their disclosure to the respondents' solicitors.

The central legal issues before the High Court were whether the Supreme Court possessed the power to permit the amendment of the Lists of Documents to reassert privilege over the inadvertently disclosed documents, and whether it had the power to order the respondents' solicitors to return these documents. The court also considered whether the appellants' actions constituted a waiver of client legal privilege and the correct jurisdictional basis for ordering the return of inadvertently disclosed documents.

The High Court reasoned that the power to permit amendment of discovery documents, including the reassertion of privilege, is inherent in the court's case management powers and is essential for the just and efficient conduct of litigation. It held that the inadvertent disclosure of privileged documents does not automatically result in a waiver of privilege, provided that the party claiming privilege acts promptly to rectify the error and demonstrates that their conduct is consistent with maintaining the privilege. The court affirmed that the inherent equitable jurisdiction of the court, as well as statutory provisions relating to discovery, provided the power to order the return of inadvertently disclosed privileged documents.

The appeal was allowed, the orders of the Court of Appeal were set aside, and the Supreme Court's earlier order was replaced with an order that the respondents pay the appellants' costs. Specific directions were given for the return and deletion of the four identified privileged documents.