Sibley v Kais

The High Court of Australia heard an appeal in *Sibley v Kais*. The dispute concerned the interpretation of a clause in a contract for the sale of land, specifically whether the purchaser had validly exercised an option to purchase the land. The vendor argued that the purchaser had failed to comply with a condition precedent to the exercise of the option, rendering the purported exercise ineffective.

The central legal issue before the Court was whether the purchaser's notice of exercise of the option was validly given, notwithstanding that it was sent by registered post to the vendor's last known address rather than being personally delivered or sent by ordinary post as stipulated in the contract. The Court was required to determine the legal effect of the purchaser's chosen method of communication in light of the contractual terms and the relevant principles of contract law concerning the communication of acceptance.

The High Court held that the contractual provision specifying the method of communication was a condition precedent that had to be strictly complied with. The Court reasoned that where a contract prescribes a particular mode of communication for the exercise of an option, that mode must be followed. Sending the notice by registered post, while arguably more secure, did not conform to the express terms of the agreement, which contemplated ordinary post or personal delivery. Consequently, the Court found that the option had not been validly exercised.

The High Court allowed the appeal, setting aside the order of the lower court. The Court declared that the contract for the sale of land had not been validly entered into by the exercise of the option.