later forensic ballistics expert cast doubt on whether Craig could have hit Miles if he had shot at him deliberately: The fatal bullet was not found. Craig had used bullets of different undersized calibres, and the sawn-off barrel made it inaccurate to a degree of six feet at the range from which he fired. Secondly, there was controversy over the existence and meaning of Bentley's alleged instruction to Craig, "let him have it, Chris". Craig and Bentley denied that Bentley had said the words while the police officers testified that he had said them. Further, Bentley's counsel argued that even if he had said the words, it could not be proven that Bentley had intended the words to mean the informal meaning of "shoot him, Chris" instead of the literal meaning of "give him the gun, Chris". Thirdly, there was disagreement over whether Bentley was fit to stand trial in light of his mental capacity. The Principal Medical Officer responsible was Dr Matheson and he referred Bentley to Dr. Hill, a psychiatrist at the Maudsley Hospital. Hill's report stated that Bentley was illiterate and of low intelligence, almost borderline retarded. However, Matheson was of the opinion that whilst agreeing that Bentley was of low intelligence, he did not have epilepsy at the time of the alleged offence and he was not a "feeble-minded person" under the Mental Deficiency Acts. Matheson said that he was sane and fit to plead and stand trial. English law at the time did not recognise the concept of diminished responsibility due to retarded development, though it existed in Scottish law (it was introduced to England by the Homicide Act 1957). Criminal insanity – where the accused is unable to distinguish right from wrong – was then the only medical defence to murder. Bentley, while he had a severe debilitation, was not insane. The jury took 75 minutes to decide that both Craig and Bentley were guilty of Miles's murder, with a plea for mercy for Bentley. Bentley was sentenced to death whilst Craig was ordered to be detained at Her Majesty's Pleasure. He was eventually released in May 1963 after serving 10 years' imprisonment, married two years later and subsequently became a plumber. Bentley was originally scheduled to be hanged on 30 December 1952 but this was postponed to allow for an appeal. Bentley's lawyers filed appeals highlighting the ambiguities of the ballistic evidence, Bentley's