"The best point the prosecution has, it seems to me, is that the neck is an obviously vulnerable part of the body. But the defence point out that this is not any form of frenzied attack. It is a single stab wound with limited penetration. The circumstances, as I have indicated, are unknown, and it seems to me on balance, and only just on balance, that the count of manslaughter should be left to the jury."
"Here, the [appellant] accepts he was present but says somebody else, a mystery man, delivered the fatal blow. He has not advanced any evidence of any belief that he needed to use force to defend himself, and certainly not by striking out with any knife or bladed article. To admit self-defence in those circumstances would involve entirely a speculative cause of action on the part of the jury as to what the [appellant] believed. ... in this case ... there is no evidence on which a defence of self-defence can be left to the jury. It is simply not a viable course on the evidence that there is."
"When is evidence sufficient to raise an issue, for example, self-defence, fit to be left to a jury? The question is one for the trial judge to answer by applying common sense to the evidence in the particular case. We do not think it right to go further in this case than to state our view that self-defence should be left to the jury when there is evidence sufficiently strong to raise a prima facie case of self-defence if it is accepted. To invite the jury to consider self-defence upon evidence which does not reach this standard would be to invite speculation. It is plain that there may be evidence of self-defence even though a defendant asserts that he was not present."
"It is clear that perfectly hopeless defences which have no factual basis of support do not have to be left to the jury. But it is no less clear, in their Lordships' view, that if the accused's account of what happened includes matters which if accepted could raise a prima facie case of self-defence this should be left to the jury even if the accused has not formally relied upon self-defence."