Macquarie International Health Clinic Pty Ltd v Sydney Local Health District Sydney Local Health District v Macquarie Health Corporation Ltd (No 5)

The case involved two separate appeals by Macquarie International Health Clinic Pty Ltd and Macquarie Health Corporation Ltd against Sydney Local Health District. The primary dispute centred on whether the Sydney Local Health District breached contractual obligations with Macquarie International Health Clinic, which in turn had a contractual relationship with Macquarie Health Corporation. The court had to determine if the health district's actions constituted a breach of contract and whether the expert evidence presented was admissible under the Evidence Act 1995 (NSW). The matter was heard and determined in the Supreme Court of New South Wales.

The central legal issue was the admissibility of expert evidence provided by Dr David Penington, a witness for Macquarie International Health Clinic. Specifically, the court had to consider whether Dr Penington's evidence breached the distinction required by section 60 of the Evidence Act 1995 (NSW), which pertains to the proof of assumed primary facts versus the knowledge relied upon by the expert. The Sydney Local Health District argued that Dr Penington's evidence conflated these two aspects, thus making it inadmissible. Conversely, Macquarie International Health Clinic contended that the evidence was properly distinguished and was admissible to assist the court in understanding the expert's opinion.

In its judgment, the court ruled that Dr Penington's evidence did indeed conflate the distinction required by section 60 of the Evidence Act. The court found that the expert witness's opinion was based on assumptions and knowledge that were not sufficiently separated from the facts that the expert was asked to assume for the purposes of giving evidence. This conflation rendered the evidence inadmissible as it did not comply with the statutory requirements. The court further held that this error was not merely technical but substantive, as it undermined the reliability of the expert opinion. Consequently, the court excluded the evidence from consideration.

The final orders of the court were that the appeal by Macquarie International Health Clinic and Macquarie Health Corporation Ltd was dismissed. The court held that the evidence provided by Dr Penington was inadmissible under the provisions of the Evidence Act 1995 (NSW). As a result, the lower court's decision that the Sydney Local Health District had not breached its contractual obligations remained unaffected.