“(1) A person (“D”) who kills or is a party to the killing of another is not to be convicted of murder if D was suffering from an abnormality of mental functioning which— (a) arose from a recognised medical condition, (b) substantially impaired D's ability to do one or more of the things mentioned in subsection (1A), and (c) provides an explanation for D's acts and omissions in doing or being a party to the killing. (1A) Those things are— (a) to understand the nature of D's conduct; (b) to form a rational judgment; (c) to exercise self-control. (1B) For the purposes of subsection (1)(c), an abnormality of mental functioning provides an explanation for D's conduct if it causes, or is a significant contributory factor in causing, D to carry out that conduct.”
“If and in so far as you conclude a personality disorder reduced his general capacity for tolerance or self-restraint, that would not be a relevant circumstance when you are considering the defence of loss of control. But it is important to emphasise that this exclusion only relates to any feature of a personality disorder which reduced his general capacity for tolerance or self-restraint. Let me give you an illustration. If you thought that CW suffered from a personality disorder which made him unusually likely to become angry and aggressive at the slightest provocation, that would of course be relevant to diminished responsibility but it could not assist him in relation to loss of control. But if you thought that a personality disorder had caused him to attempt suicide, then you would be entitled to take into account as one of his circumstances the effect on him of being taunted that he should have killed himself.”
“Given the condition that you find Charice Gassmann was in that morning as a result of her grandfather/abuser’s death, how might a person of her age and sex in that condition have reacted to the provocation had she had normal powers of tolerance and self-restraint?”
“In our view the correct approach by the judge, after a trial, to the determination of the factual basis upon which to pass sentence, is clear. If there is only one possible interpretation of a jury's verdict(s) then the judge must sentence on that basis. When there is more than one possible interpretation, then the judge must make up his own mind, to the criminal standard, as to the factual basis upon which to pass sentence. If there is more than one possible interpretation, and he is not sure of any of them, then (in accordance with basic fairness) he is obliged to pass sentence on the basis of the interpretation (whether in whole or in relevant part) most favourable to the defendant.”