“That it was done either intentionally i.e. intending to cause damage to the building or recklessly. What is meant by recklessly? A person acts recklessly if he/she is aware that his/her act has created a risk that damage may be caused i.e. that the fire would spread to the tyres and to the building and it is in the circumstances known to him unreasonable to take such risk. That at the time of setting the fire he/she was reckless whether the life of another or others would thereby be endangered. What has to be proved by the evidence is that the defendant was actually aware of a risk that his setting fire to the building would endanger the life of another or others and that in the circumstances that were known to him/her it was unreasonable to take that risk. If that is proved by the evidence, then he/she is guilty.”
“A man who rushes into a house flourishing a naked razor and wounds someone, even accidentally, is still guilty of manslaughter if that person dies.”
“… the conclusion of this court is that an unlawful act causing the death of another cannot, simply because it is an unlawful act, render a manslaughter verdict inevitable. For such a verdict inexorably to follow, the unlawful act must be such as all sober and reasonable people would inevitably recognise must subject the other person to, at least, the risk of some harm resulting therefrom, albeit not serious harm.”
“It makes it plain (a) that an accused is guilty of manslaughter if it is proved that he intentionally did an act which was unlawful and dangerous and that that act inadvertently caused death and (b) that it is unnecessary to prove that the accused knew that the act was unlawful or dangerous. This is one of the reasons why cases of manslaughter vary so infinitely in their gravity. They may amount to little more than pure inadvertence and sometimes to little less than murder. … The test is still the objective test. In judging whether the act was dangerous the test is not did the accused recognise that it was dangerous but would all sober and reasonable people recognise its danger.”
“… mens rea being now an essential ingredient in manslaughter (compare Andrews v DPP and R v Church that could not be established in relation to [unlawful act manslaughter] except by proving that element of intent without which there can be no assault.”
“R v Lamb was referred to by Lord Denning M.R. for the proposition that in manslaughter there must always be a guilty mind. This is true of every crime except those of absolute liability. The guilty mind usually depends on the intention of the accused. Some crimes require what is sometimes called a specific intention, for example murder, which is killing with intent to inflict grievous bodily harm. Other crimes need only what is called a basic intention, which is an intention to do the acts which constitute the crime. Manslaughter is such a crime: see R v Larkin, and R v Church. R v Lamb is certainly no authority to the contrary.”
“In the longer term, common law manslaughter ought to be revisited by the Law Commission, since its most recent review of homicide law was focused on other matters and consequently treated this form of manslaughter rather cursorily: Law Com. No.304, Murder, Manslaughter and Infanticide (2006), pp.61–64. It is unlikely that the conflict of principle referred to [earlier in the comment] will be resolved to the satisfaction of all, but it is more appropriate that there be wide consultation on detailed questions about the ambit of any such offence than that these issues be resolved piecemeal by the courts, without clear parameters to guide them.”