Ayles v The Queen

This case concerned an appeal by the appellant against his conviction for an offence. The central dispute revolved around the trial judge's power to amend an information without a formal application from the prosecutor, and whether such an amendment, made without affording the appellant an opportunity to make submissions, complied with the requirements of procedural fairness. The High Court of Australia was required to determine the validity of the amendment and its impact on the conviction.

The legal issues before the High Court included whether the trial judge possessed the power under s 281(2) of the Criminal Law Consolidation Act 1935 (SA) to amend the information without an application from the prosecutor, the distinct functions of a judge and a prosecutor in this regard, and whether the amendment, as made, conformed to the prosecutor's intention. Furthermore, the Court had to consider whether the amendment, made without providing the appellant an opportunity to make submissions, breached the principles of procedural fairness, and whether the incomplete notation of the amendment on the information affected its validity.

A majority of the High Court found that the trial judge's purported amendment was defective on two grounds: firstly, because no application had been made by counsel, the judge lacked the power to make the amendment; and secondly, the amendment to the statement of the offence was not properly noted on the information itself. The Court held that the trial judge had misconstrued her powers of amendment, leading to a "wrong decision on a question of law." However, applying the proviso, the majority concluded that no substantial miscarriage of justice had occurred because the appellant had admitted his guilt to the substance of the offence through his own testimony, and no prejudice had accrued to his defence.

The appeal was dismissed by a majority of the High Court, with Gleeson CJ, Heydon and Kiefel JJ forming the majority, and Gummow and Kirby JJ dissenting.