The first task of this Court is to consider the circumstances in which the absence at a trial of evidence subsequently available may be said to have resulted in a miscarriage of justice. After giving the problem the fullest consideration I am satisfied that the Full Court was correct in stating the law as it did. A miscarriage of justice of the first kind mentioned by the Full Court, i.e. the absence of a fair trial, is not a conception that, so far as I am aware, has previously been applied to the discovery of fresh evidence, but, having been stated as it was by the Full Court, the conception commands acceptance on fundamental grounds. If an accused did not have a fair trial his conviction was a miscarriage of justice. No criticism was made of this conception but its application did not lead to the Full Court thinking that there had been a miscarriage of justice. It could be but rarely that a miscarriage of this sort could follow from the defence deliberately adopting a particular course at a trial, e.g. by not calling available evidence. It is the second conception of a miscarriage of justice adumbrated by the Full Court that was criticized by counsel for the petitioner, who argued that it was not for the Full Court to evaluate the fresh evidence adduced beyond the judges satisfying themselves that such evidence was credible and could, in conjunction with the evidence given, cause a jury to entertain a reasonable doubt about the guilt of the convicted accused. In my judgment the absence at the trial of evidence subsequently available works a miscarriage of justice in the second sense only if the court of appeal concludes that additional credible evidence, in conjunction with the other evidence in the case, ought to have resulted in a verdict of not guilty rather than a verdict of guilty because, if believed, it would at least raise a reasonable doubt of guilt. The absence of such evidence which, if given, ought, in the opinion of the court, to have led to an acquittal constitutes an acceptable basis for concluding that there was a miscarriage of justice at the trial; the absence of evidence which, if given, might perhaps have led to an acquittal does not provide any basis for an affirmative conclusion that there was a miscarriage of justice at the trial. If a conviction is set aside on the ground that there was a miscarriage of justice, it is then for the court to decide further, whether in the circumstances, there should be a new trial or an acquittal: see s. 568(2).