Editing M'Naghten rules (section)

===Nature and quality of the act===
This phrase refers to the physical nature and quality of the act, rather than the moral quality. It covers the situation where the defendant does not know what he is physically doing. Two common examples used are:
* The defendant cuts a woman's throat under the delusion that he is cutting a loaf of bread,
* The defendant chops off a sleeping man's head because he has the deluded idea that it would be great fun to see the man looking for it when he wakes up.
The judges were specifically asked if a person could be excused if he committed an offence in consequence of an insane delusion. They replied that if he labours under such partial delusion only, and is not in other respects insane, "he must be considered in the same situation as to responsibility as if the facts with respect to which the delusion exists were real". This rule requires the court to take the facts as the accused believed them to be and follows ''Hadfield's Trial'', above. If the delusions do not prevent the defendant from having mens rea there will be no defence. 

In ''R v Bell'' 1984 Crim. LR 685, the defendant smashed a van through the entrance gates of a holiday camp because "It was like a secret society in there, I wanted to do my bit against it" as instructed by God. It was held that, as the defendant had been aware of his actions, he could neither have been in a state of automatism nor insane, and the fact that he believed that God had told him to do this merely provided an explanation of his motive and did not prevent him from knowing that what he was doing was wrong in the legal sense.