Maybury v Atlantic Union Oil Co Ltd

The appeal concerned a dispute between Atlantic Union Oil Company Limited (the respondent) and J. E. Maybury and another (the appellants) arising from written agreements for the production and broadcasting of radio advertisements. The respondent sued for money owing under these agreements, and the appellants sought to counterclaim for damages based on an alleged oral collateral agreement and a breach of the written agreements themselves. The matter proceeded in the Supreme Court of New South Wales, where preliminary points of law were argued before Kinsella J.

The primary legal issues before the High Court were whether the alleged oral collateral agreement was enforceable, given its potential inconsistency with the written agreements, and whether the written agreements imposed an obligation on the respondent not to broadcast the radio programmes more than once weekly. The appellants also raised a preliminary objection regarding the competency of the appeal, arguing that the judgment entered in the Supreme Court was not a final judgment from which an appeal lay as of right.

The High Court dismissed the appeal, affirming the decision of Kinsella J. Regarding the alleged oral collateral agreement, the Court held that it was inconsistent with the express terms of the written agreements, particularly clause 3 which granted the respondent company a broad discretion to determine the date, hour, and time of broadcasts. The Court applied the principle from *Hoyt's Pty. Ltd. v. Spencer* that a collateral agreement cannot impinge upon or alter the provisions or rights created by the main written agreement. The Court also found that the fourth plea, alleging a breach of the written agreement by broadcasting more than once weekly, failed because the written agreements did not impose such a restriction on the respondent and, in fact, contemplated the use of recordings.

The Court noted that while there were procedural difficulties concerning the appeal's competency due to the consent entry of judgment without a full trial, it based its decision on the substantive merits of the case. Consequently, the appeal was dismissed with costs.