49 The case against the appellant was a strong one if the jury accepted the evidence of Vogler which was the essence of the Crown case. The appellant's complaint in this case is, not so much that the certificate of conviction was tendered, as that the appellant was deprived of the opportunity to cross-examine Bonner. Indeed, counsel for the appellant concedes that had Bonner given evidence and been cross-examined, it was almost inevitable that evidence of Bonner's conviction would have emerged, in which case there could be no proper complaint. The cross-examination of Vogler shows that it was the appellant's case that the appellant had nothing to do with Bonner and did not procure Vogler to commit the offence. The Crown decided not to call Bonner as he had given a number of different versions and was regarded by them as unreliable. He was available to be called by the appellant but understandably the appellant had similar concerns, especially if unable to cross-examine. Although the complainant had no memory of the attack and could not implicate Bonner, other evidence led at the trial, apart from the conviction, suggested that Bonner committed the offence, including the booking of plane tickets by Mrs Vogler for Bonner and evidence that Vogler and Bonner were seen together on the night of the assault. Vogler's evidence was supported by the independent evidence of the appellant's concealed withdrawal of $2,500 on the day Vogler claims to have paid this sum to Bonner and by the prior threats Randell claims the appellant made to him. However, the impact of the evidence of Bonner's conviction of this offence, in a commonsense way, was evidence which it is likely the jury would use to support Vogler's account, and infer the appellant's complicity as discussed in O'Connor, Robertson and Curry. The summing-up by the learned trial judge made this more, not less, likely. The inability of the appellant's counsel to cross-examine Bonner in those circumstances meant that, despite the very considerable strengths of the Crown case, the appellant may have been deprived of the chance of an acquittal by the wrongful admission of the evidence of the conviction of Bonner. It cannot be said that there has been no substantial miscarriage of justice such as would warrant the exercise of the proviso in s 668E(1A) of the Criminal Code.