'... 
                              the ordinary principles of the law of negligence 
                              apply to ascertain whether or not the defendant 
                              has been in breach of a duty of care towards the 
                              victim who has died. If such a breach of duty is 
                              established the next question is whether that breach 
                              of duty caused the death of the victim. If so, the 
                              jury must go on to consider whether that breach 
                              of duty should be characterised as gross negligence 
                              and therefore as a crime. This will depend on the 
                              seriousness of the breach of duty committed by the 
                              defendant in all the circumstances in which the 
                              defendant was placed when it occurred. The jury 
                              will have to consider whether the extent to which 
                              the defendant's conduct departed from the proper 
                              standard of care incumbent upon him, involving as 
                              it must have done a risk of death to the patient, 
                              was such that it could be judged criminal.
                              
                              It is true that to a certain extent this involves 
                              an element of circularity, but in this branch of 
                              the law I do not believe that is fatal to its being 
                              correct as a test of how far conduct must depart 
                              from accepted standards to be characterised as criminal. 
                              This is necessarily a question of degree and an 
                              attempt to specify that degree more closely is I 
                              think likely to achieve only a spurious precision. 
                              The essence of the matter, which is supremely a 
                              jury question, is whether, having regard to the 
                              risk of death involved, the conduct of the defendant 
                              was so bad in all the circumstances as to amount 
                              in their 
                              judgment to a criminal act or omission.
                            To 
                              access judgment, click on hyperlink - [1995] 
                              1 AC 171