CGU Insurance Limited v Watson

CGU Insurance Limited (CGU) appealed to the High Court of Australia against a decision of the Full Court of the Supreme Court of South Australia, which had overturned a judgment in favour of CGU. The dispute concerned the interpretation of a workers' compensation insurance policy and whether it covered a claim made by Mr. Watson, a former employee of a company insured by CGU, for a psychiatric injury allegedly sustained during his employment. The primary issue was whether the policy's exclusion clause, which excluded liability for claims arising from "stress, shock, fright or mental disorder," applied to Mr. Watson's claim.

The High Court was required to determine whether the Full Court of the Supreme Court of South Australia had erred in its interpretation of the exclusion clause. Specifically, the court had to consider whether the exclusion clause was intended to apply to all claims involving psychiatric injury, regardless of the cause, or whether it was limited to claims where the injury was solely or primarily caused by psychological factors rather than physical ones. The central question was the scope and effect of the exclusion in the context of a workers' compensation claim for a psychiatric condition.

The High Court, in allowing CGU's appeal, held that the exclusion clause was clear and unambiguous in its wording. The court reasoned that the phrase "mental disorder" encompassed psychiatric injury, and the exclusion was intended to operate broadly to exclude claims for such conditions. The judges found that the Full Court had erred by seeking to limit the operation of the exclusion clause by reference to the cause of the mental disorder, when the plain language of the clause did not support such a limitation. The court affirmed the principle that clear and unambiguous exclusion clauses in insurance policies should be given their ordinary and natural meaning.

The High Court ordered that the appeal be allowed and the judgment of the Full Court of the Supreme Court of South Australia be set aside. The original judgment in favour of CGU Insurance Limited was reinstated.