“1. Mr Henry is a fairly disturbed individual who gives an impression of his intellectual capabilities which is totally wrong. He has a tendency to fail to see the significance of acting by himself leading him into difficulties. 2. He is easily imposed upon as may be noted by the influence his girlfriend had upon him to commit certain acts which led to his conviction. This is again partly attributable to his low intellectual ability to reason matters out as well as psychological problems which would make him susceptible to fall under the influence of others. 3. Mr Henry falls into the category of just being above the mentally defective area or what is commonly termed ‘borderline’ defective area of intellectual ability … Mr Henry is a strange man with a Walter Mitty-type of attitude to viewing himself as a clever individual capable of carrying out a crime of a very serious nature and yet not having the mental capacity to see matters through logically and reasonably … It is unfortunate for him that he has a bearing of an intellectual but the capacity of someone of virtually mentally defective ability. While this does not excuse his offences, it does or could provide mitigation.”
“1. The current intellectual assessment … indicates that Mr Henry is functioning in the borderline range of learning disability. His full scale score of 71 falls at the bottom 3% of the general population. This suggests a significant intellectual impairment … 2. I found no evidence that Mr Henry is currently mentally ill nor is there evidence that he has ever been mentally ill … he seems to have serious emotional problems, including a high level of anxiety, proneness towards agitation, self-defeating personality structure, dependence needs and extremely poor self-esteem … 3. In summary, Mr Henry is a psychologically vulnerable individual, whose intellectual abilities are very limited, in social interactions he undoubtedly tried to cover up his limited abilities and he superficially presents as intellectually brighter than he actually is … It is likely that these problems interfere with his effectively coping with stress and demands placed upon him by others (eg Miss Bailey involving him in arranging a hitman to deal with [Anna].”
“An expert’s opinion is admissible to furnish the Court with scientific information which is likely to be outside the experience and knowledge of a judge or jury. If on the proven facts a judge or jury can form their own conclusions without help, then the opinion of an expert is unnecessary.”
“Generally speaking, if a defendant is mentally defective, or otherwise comes in the last class, ‘69 and below mental defective’, then in so far as that defectiveness is relevant – relevant that is to the particular case – it may be that expert evidence should be admitted about it. That is in order to enlighten the jury upon a matter which is abnormal, and therefore ex hypothesi, presumably, outside their own experience. If it is admitted it should be confined to the assessment of the defendant’s Intelligence Quotient, and to an explanation of any relevant abnormal characteristics which such an assessment involves … Where the defendant however is within the scale of normality, albeit, as this man was, at the lower end of that scale, expert evidence, in our judgment, is not as a rule, necessary and should be excluded.”
“… we do not know what, if any, effect mild hypoglycaemia can have upon a man’s ability to form an intent, and without that expert evidence the jury were deprived of assistance in a field where their ordinary experience did not enable them to judge for themselves.”