"54. Partial defence to murder: loss of control (1) Where a person ('D') kills or is a party to the killing of another ('V'), D is not to be convicted of murder if— (a) D's acts and omissions in doing or being a party to the killing resulted from D's loss of self-control, (b) the loss of self-control had a qualifying trigger, and (c) a person of D's sex and age, with a normal degree of tolerance and self-restraint and in the circumstances of D, might have reacted in the same or in a similar way to D. (2) For the purposes of subsection (1)(a), it does not matter whether or not the loss of control was sudden. (3) In subsection (1)(c) the reference to 'the circumstances of D' is a reference to all of D's circumstances other than those whose only relevance to D's conduct is that they bear on D's general capacity for tolerance or self-restraint. (4) Subsection (1) does not apply if, in doing or being a party to the killing, D acted in a considered desire for revenge. (5) On a charge of murder, if sufficient evidence is adduced to raise an issue with respect to the defence under subsection (1), the jury must assume that the defence is satisfied unless the prosecution proves beyond reasonable doubt that it is not. (6) For the purposes of subsection (5), sufficient evidence is adduced to raise an issue with respect to the defence if evidence is adduced on which, in the opinion of the trial judge, a jury, properly directed, could reasonably conclude that the defence might apply. (7) A person who, but for this section, would be liable to be convicted of murder is liable instead to be convicted of manslaughter. … 55. Meaning of 'qualifying trigger' (1) This section applies for the purposes of section 54. (2) A loss of self-control had a qualifying trigger if subsection (3), (4) or (5) applies. (3) This subsection applies if D's loss of self-control was attributable to D's fear of serious violence from V against D or another identified person. (4) This subsection applies if D's loss of self-control was attributable to a thing or things done or said (or both) which — (a) constituted circumstances of an extremely grave character, and (b) caused D to have a justifiable sense of being seriously wronged. (5) This subsection applies if D's loss of self-control was attributable to a combination of the matters mentioned in subsections (3) and (4). (6) In determining whether a loss of self-control had a qualifying trigger — (a) D's fear of serious violence is to be disregarded to the extent that it was caused by a thing which D incited to be done or said for the purpose of providing an excuse to use violence; (b) a sense of being seriously wronged by a thing done or said is not justifiable if D incited the thing to be done or said for the purpose of providing an excuse to use violence; (c) the fact that a thing done or said constituted sexual infidelity is to be disregarded. (7) In this section references to 'D' and 'V' are to be construed in accordance with section 54."
"When a person kills or is party to the killing of another person, unless he has acted in a considered desire for revenge, he is not to be convicted of murder, but of manslaughter, if each of three distinct ingredients which comprise the defence may be present. If evidence sufficient to raise an issue in relation to all three ingredients is adduced, the prosecution must disprove the defence. But the evidence is not sufficient for this purpose unless, in the opinion of the trial judge, a jury, properly directed, could reasonably conclude that the defence might apply. If so, the defence must be left to the jury and the prosecution must disprove it. …"
"(1) The required opinion is to be formed as a common sense judgment based on an analysis of all the evidence. (2) If there is sufficient evidence to raise an issue with respect to the defence of loss of control, then it is to be left the jury whether or not the issue had been expressly advanced as part of the defence case at trial. (3) The appellate court will give due weight to the evaluation ('the opinion') of the trial judge, who will have had the considerable advantage of conducting the trial and hearing all the evidence and having the feel of the case. As has been said, the appellate court 'will not readily interfere with that judgment'. (4) However, that evaluation is not to be equated with an exercise of discretion such that the appellate court is only concerned with whether the decision was within a reasonable range of responses on the part of the trial judge. Rather, the judge's evaluation has to be appraised as either being right or wrong: it is a 'yes' or 'no' matter. (5) The 2009 Act is specific by section 54(5) and (6) that the evidence must be 'sufficient' to raise an issue. It is not enough if there is simply some evidence falling short of sufficient evidence. (6) The existence of a qualifying trigger does not necessarily connote that there will have been a loss of control. (7) For the purpose of forming his or her opinion, the trial judge, whilst of course entitled to assess the quality and weight of the evidence, ordinarily should not reject evidence which the jury could reasonably accept. It must be recognised that a jury may accept the evidence which is most favourable to a defendant. (8) The statutory defence of loss of control is significantly different from and more restrictive than the previous defence of provocation which it has entirely superseded. (9) Perhaps in consequence of all the foregoing, 'a much more rigorous evaluation' on the part of the trial judge is called for than might have been the case under the previous law of provocation. (10) The statutory components of the defence are to be appraised sequentially and separately; and (11) And not least, each case is to be assessed by reference to its own particular facts and circumstances."
"A reasonable inference is that he selected a second knife from the block that was used to continue the attack on [Sally]. [The appellant's] account that he took the second knife back into the kitchen and put it on the work surface does not explain how or why a second knife had been selected. The second knife was selected because the first knife broke."
"… the ready inference is that [the appellant] was in control enough to leave the lounge with the coffee cups, arm himself with a large knife, pause the attack when that knife stopped working, go back to the kitchen, select a second weapon from the knife block and then recommence stabbing her as [Sally] tried to escape." (3) Although the defence relied on the contrast between the events of22nd June 2022 and the evidence of workmates that the appellant was "a gentle giant", there were limitations to that evidence and some of the text messages "could suggest that [the appellant] planned to harm"