"(2) The Court of Appeal shall, in considering whether to receive any evidence, have regard in particular to – (a) whether the evidence appears to the Court to be capable of belief; (b) whether it appears to the Court that the evidence may afford any ground for allowing the appeal; (c) whether the evidence would have been admissible in the proceedings from which the appeal lies on an issue which is the subject of the appeal; and (d) whether there is a reasonable explanation for the failure to adduce the evidence in those proceedings."
"First, it reminds the Court of Appeal that it is not and should never become the primary decision-maker. Secondly, it reminds the Court of Appeal that it has an imperfect and incomplete understanding of the full process which led the jury to convict. The Court of Appeal can make its assessment of the fresh evidence it has heard, but save in a clear case it is at a disadvantage in seeking to relate that evidence to the rest of the evidence which the jury heard. For these reasons it will usually be wise for the Court of Appeal, in a case of any difficulty, to test their own provisional view by asking whether the evidence, if given at the trial, might reasonably have affected the decision of the trial jury to convict. If it might, the conviction must be thought to be unsafe."
"But we conclude on the authorities as they now stand that the expert evidence of a psychiatrist or a psychologist may properly be admitted if it is to the effect that a defendant is suffering from a condition not properly described as mental illness, but from a personality disorder so severe as properly to be categorised as mental disorder."
"...one must confine the extent of psychiatric evidence called in criminal trials strictly within the limits laid down by Lord Pearce in Toohey’s case [49 Cr App R 148 at 162-163]. If one did not one would almost have trial by psychiatrist rather than trial by jury. There is no express material before me that Childs is suffering from any mental disease, defect or abnormality of mind that might affect the reliability of his evidence..."
"... being refused access to Childs and his close associates, I have been able to observe Childs’ examination-in-chief and his cross-examination by Mr Mansfield and to analyse relevant witness statements, depositions etc. Even though these sources of data are limited, I find that what I have observed is sufficiently consistent to come to certain limited conclusions..."
"The constellation of behaviour characteristics which Childs manifests fits closely with the general syndrome referred to.... as psychopathy...on the balance of probabilities the disordered nature of Childs’ behaviour and social sense is sufficient to call into doubt the reliability of his testimony... that because of the nature of Childs’ personality and his characteristic response to social situations, including the task of responding to cross-examination, the jury are deprived of many of the normal methods by which the lay observer judges the credibility of a statement."
"Childs’ personality characteristics taken together, and separately, are such that they necessarily cast some doubt on his reliability as a witness..."