Helicopter Aerial Surveys Pty Ltd v Robertson

The case of Helicopter Aerial Surveys Pty Ltd v Robertson involved a dispute where the plaintiff sought to use documents that had been disclosed voluntarily by the defendant. The legal issues centred on whether an implied undertaking, as discussed in Harman v Secretary of State for the Home Department, applied to documents disclosed without an order for discovery or other compulsory process. The court had to determine the scope of such an implied undertaking and whether it attached to affidavits in the same way it would to witness statements. Additionally, the court examined whether the documents, subject to an undertaking, could be used for purposes other than their original intent if special circumstances or good reasons warranted such relief.

The court held that an implied undertaking does apply to documents disclosed voluntarily in the absence of any compulsory process. This undertaking is not contingent on the compulsion of the disclosure and is instead based on the principle of fairness in litigation. The court found that the implied undertaking was subject to positive obligations, which included the duty to provide discovery or to answer a subpoena. Furthermore, the court ruled that the undertaking did not automatically attach to affidavits unless they were sufficiently analogous to witness statements. Finally, the court considered whether the documents could be used for extraneous purposes and concluded that relief from the undertaking could be granted if there were special circumstances or other good reasons.

The court granted the plaintiff leave to use the documents for purposes other than those originally intended, finding that the circumstances warranted such relief. This decision was based on the principle that the primary objective of litigation is the just resolution of the dispute, and in this case, the use of the documents for extraneous purposes served that objective. The court's ruling provided clarity on the application of implied undertakings to voluntarily disclosed documents and the circumstances under which they may be used for purposes beyond their original intent.