"If you come to the conclusion that the defendant, or if this applies to both of them Mr. Williams and Mr. Theodore, had a belief - had the honest and genuine belief - and one could use all sorts of adjectives before the word 'belief' but I am not sure they add very much - had the true belief and the reasonable belief, that is to say, the belief based on reasonable grounds that Mason was acting unlawfully, than their use of force would be excused provided again that it was in all the circumstances reasonable and directed to preventing crime, namely the assault upon the youth, and directed to no more than that in the way that I have explained. "
"Even if the defendant may have genuinely believed that what he was doing to the victim was either with the victim's consent or in reasonable self-defence or to prevent the commission of crime, as the case may be, nevertheless if you, the jury, come to the conclusion that the mistaken belief was unreasonable, that is to say that the defendant as a reasonable man should have realised his mistake, then you should convict him. "
"The application of the Morgan principle to offences other than indecent assault on a woman will have to be considered when such offences come before the courts. We do, however, think it necessary to consider two of them because of what was said in the judgment. The first is a decision of the Divisional Court in Albert v. Lavin (1982) A. C. 546. The offence charged was assaulting a police officer in the execution of his duty, contrary tosection 51 of the Police Act 1964 . The defendant in his defence contended, inter alia, that he had not believed the police officer to be such and in consequence had resisted arrest. His counsel analysed the offence in the same way as we have done and referred to the reasoning in Morgan. Mr. Justice Hodgson delivering the leading judgment, rejected this argument and in doing so said: 'But in my judgment Mr. Walker's ingenious argument fails at an earlier stage. It does not seem to me that the element of unlawfulness can properly be regarded as part of the definitional elements of the offence. In defining a criminal offence the word "unlawful" is surely tautologous and can add nothing to its essential ingredients… And no matter how strange it may seem that a defendant charged with assault can escape conviction if he shows that he mistakenly but unreasonably thought his victim was consenting but not if he was in the same state of mind as to whether his victim had a right to detain him , that in my judgement is the law.' "
"The common law defence of self-defence should be replaced by a statutory defence providing that a person may use such force as is reasonable in the circumstances as he believes them to be in the defence of himself or any other person. "
"If you come to the conclusion that the defendant, or if this applies to both of them Mr. Williams and Mr. Theodore, had a belief - had the honest and genuine belief - and one could use all sorts of adjectives before the word 'belief' but I am not sure they add very much - had the true belief and the reasonable belief, that is to say, the belief based on reasonable grounds that Mason was acting unlawfully, than their use of force would be excused provided again that it was in all the circumstances reasonable and directed to preventing crime, namely the assault upon the youth, and directed to no more than that in the way that I have explained. "
"Even if the defendant may have genuinely believed that what he was doing to the victim was either with the victim's consent or in reasonable self-defence or to prevent the commission of crime, as the case may be, nevertheless if you, the jury, come to the conclusion that the mistaken belief was unreasonable, that is to say that the defendant as a reasonable man should have realised his mistake, then you should convict him. "
"The application of the Morgan principle to offences other than indecent assault on a woman will have to be considered when such offences come before the courts. We do, however, think it necessary to consider two of them because of what was said in the judgment. The first is a decision of the Divisional Court in Albert v. Lavin (1982) A. C. 546. The offence charged was assaulting a police officer in the execution of his duty, contrary tosection 51 of the Police Act 1964 . The defendant in his defence contended, inter alia, that he had not believed the police officer to be such and in consequence had resisted arrest. His counsel analysed the offence in the same way as we have done and referred to the reasoning in Morgan. Mr. Justice Hodgson delivering the leading judgment, rejected this argument and in doing so said: 'But in my judgment Mr. Walker's ingenious argument fails at an earlier stage. It does not seem to me that the element of unlawfulness can properly be regarded as part of the definitional elements of the offence. In defining a criminal offence the word "unlawful" is surely tautologous and can add nothing to its essential ingredients… And no matter how strange it may seem that a defendant charged with assault can escape conviction if he shows that he mistakenly but unreasonably thought his victim was consenting but not if he was in the same state of mind as to whether his victim had a right to detain him , that in my judgement is the law.' "
"The common law defence of self-defence should be replaced by a statutory defence providing that a person may use such force as is reasonable in the circumstances as he believes them to be in the defence of himself or any other person. "