O'Brien v Bank of Western Australia Ltd

The appeal concerned a dispute between O'Brien and the Bank of Western Australia Ltd regarding a contract of guarantee. The central issue was whether certain clauses within the guarantee, specifically those relating to the suspension or preservation of rights and "no waiver" provisions, operated to prevent the Bank from enforcing the guarantee. This question arose in the context of an application for summary judgment, where the court had to determine if there was a defence with a real or more than fanciful prospect of success.

The Court of Appeal was required to determine the proper construction of the suspension/preservation of rights and no waiver clauses in the guarantee. Specifically, it had to consider whether affirmative defences, which if proven, could negate a relevant failure to pay by the borrower as at the relevant date, fell within the operation of these clauses. The court also had to assess whether the underlying defence had a real or more than fanciful prospect of success, which is the threshold for resisting summary judgment.

The Court of Appeal allowed the appeal, setting aside the previous judgment and orders of the lower court. The reasoning focused on the construction of the guarantee clauses, indicating that the defences raised were capable of falling within their operation. Consequently, the plaintiff's notice of motion for summary judgment was dismissed. The parties were directed to approach the Registrar in Equity for further directions.