"Members of the jury, I come back to the word 'unlawful'. When can violence be lawfully used? It can be used in a number of different circumstances, provided that it is reasonable. A person may use reasonable force to defend himself -- self-defence, a phrase well known to you. The law says that a person may use reasonable force to defend another person. If you see (A) attacking (B), you may intervene to protect (B) by using reasonable force to stop (A) in what he is doing. The law also provides that a person may use reasonable force to prevent crime. I give you an example -- it is not from every day life. But imagine coming upon a circumstance where you see a person with a gun who is taking aim at another person. You fear that he is going to shoot that other person. Leaving aside folly or bravery, if you grabbed hold of the man's arm and twisted it to get the gun out of that man's hand, in order to prevent the crime, provided that was reasonable, you would not yourself be committing an offence. You would be preventing the commission of a crime. Now, members of the jury, it would seem, from the way the defendant was describing the circumstances to you, that he says that he was not acting unlawfully when he slapped Kathleen Brown's face. You remember the reason he gave for it. 'She wouldn't listen and I was getting annoyed. She wasn't listening to me, when I was urging her not to let this man in. So I slapped her on the face.' Members of the jury, if it is sought to say that that application of violence to her face was lawful, because it was used to prevent the commission of crime, there is difficulty there. No one is suggesting for a moment that Kathleen Brown was going to commit any crime. What is suggested is that if she -- as she was, it is conceded, fully entitled to do, it was her home after all -- was to let John Oliver into the flat, there might be at some stage some altercation or some violence between the two men. But, members of the jury, as is conceded, there is no certainty that such was going to take place. It might well have done, but equally it might not. Bear in mind, as you weigh that up, the fact that -- and there seems to be no dispute about this -- John Oliver announced who he was, 'Its John,' or 'It's Johnny.' He did not kick the door, he did not make any threats. When told to go, and that the police were coming, he went. So, members of the jury, there is real difficulty in justifying slapping her face, when all she wanted to do was to be polite and let in someone who had been asked to come round, in justifying that on the basis that it was necessary to prevent the possibility that some offence might be committed not by her but either the man doing the slapping, or the man coming in, if he was allowed to enter the flat. So, members of the jury, if you came to the conclusion that it was or may have been the case that he had slapped her face, but were not sure that he had put his hand round her throat and rendered her blacked out for a short period of time, and if you are were sure that by slapping her face he was acting unlawfully, then, members of the jury, in those circumstances you must find him not guilty of assault occasioning actual bodily harm, but guilty of common assault -- the unlawful application of violence being in that case the slap on the face."
"Members of the jury, if you reach a position where you are not sure that she was rendered unconscious by having a hand put round her throat, and you are therefore considering the alternative offence open to you of common assault, you then have to bear in mind that such an assault would only be lawful if it was reasonable, and done to prevent the commission of crime."
"Our interpretation slap reasonable. Can this amount to prevention of crime?"
"You seek clarification of what I had to direct you about, namely when the use of force is lawful. I directed you that a person may use reasonable force. 'Reasonable' is a plain English word. Obviously, force must not be excessive or, to use a homely phrase, 'over the top'. It must be reasonable force. A person may use reasonable force to prevent the commission of crime. Now, members of the jury, that further means this. I gave you an example of a person about to shoot somebody, and a third party intervening by grabbing the person, whose hand held the gun, to prevent him committing a crime by shooting the other person. You will realise, from that example, that the law permits a person to use reasonable force against somebody who is about to commit a crime. Hence my example. The difficulty which I was explaining to you in my Summing-Up in this case is this. I use a neutral phrase, because I do not want to know about your findings. But in having some sort of touching or contact with the complainant as you find to have occurred, she was not about to commit a crime. She was about to let someone into her flat, which she was lawfully entitled to do. The fact that there was a possibility -- not a certainty but a possibility -- that if he was admitted, a crime might be committed either by him, or by this defendant, is not sufficient in this context. I hope I made that clear last time. I hope now my further directions make it clearer still... Will you please retire and continue with your discussions."
"(1) A person may use such force as is reasonable in the circumstances in the prevention of crime, or in effecting or assisting in the lawful arrest of offenders or suspected offenders or of persons unlawfully at large."
"... the provisions of this section are not intended to change the law, but to clarify it; and, as the following paragraphs reveal, it does indeed do nothing other than restate the common law principles in particular as to (i) a defendant being entitled to be judged on the facts as he believed them to be even if he made an unreasonable mistake, (ii) the defendant not being entitled to rely on a mistake as to the facts that was induced by his own voluntary intoxication, (iii) the reasonableness or otherwise of any claimed mistake going only to the issue of whether or not the claim was genuine,(iv) the force used having to be proportionate, (v) there being no expectation that in an emergency a person should weigh to a nicety the force required, and (vi) a person doing only what he instinctively and honestly thought was necessary being strong evidence that only reasonable force was used."