"11. ... In the crime of manslaughter the harm caused is an element of the offence. No harm can be more serious than the death of a victim. Its impact usually extends, as it does in this case, to the relatives who have lost a loved one. They may, understandably, feel that no sentence can properly reflect the harm that has been caused. Because of the harm caused, the offence of manslaughter will usually, though not inevitably, attract a custodial sentence, regardless of the nature of the wrongdoing that has caused the death. 12. It is right, however, that the length of the sentence must reflect the culpability of the offender. This can vary widely in the case of manslaughter from violent or reckless behaviour that foreseeably carries the risk of causing death, to a case where death results from an unlawful act as a consequence of a fortuity which the offender could not reasonably have foreseen. Death resulting from a single punch usually falls into this category. 13. The circumstances in which the punch was delivered will have a significant effect on the length of the sentence; but where the consequences of the punch were not reasonably foreseeable, care must be taken to see that the effect is not disproportionate."