This defence exists where D is put under considerable pressure to commit a crime or face death or serious injury to himself or another for whom he feels responsible
Following Southwark London Borough Council v Williams (1971), Lord Denning stated that allowing the defence of necessity would 'open a door that no man could shut' and would give an excuse for all types of behaviour
The Law Commission in the Draft Criminal Code states: 'We are not prepared to suggest that necessity should in every case be a justification; we are equally unprepared to suggest that necessity should in no case be a defence.'
Defendant thought her husband was dead and married someone else. Her conviction for bigamy was quashed as her actions were considered to be natural and legitimate by the court and in no way immoral. The court allowed the defence of mistake but did stress that the mistake had to be both reasonable and honest.
Defendant was a senior officer in the RAF and told three of his junior officers to go to his house and have sex with his wife. The court said that the belief only had to be genuine and not necessarily reasonable. Their convictions were still upheld.
D was charged with involuntary manslaughter. D and V had taken part in 'vigorous sexual activity', which V had consented to. V's consent meant there was no battery or assault, so D was not guilty of manslaughter.
D had persuaded women to allow him to measure their breasts for the purpose of compiling a database for sale to doctors. The women had only consented because they thought that D had a medical qualification or training.
V and her friend had been raped by D's friend and when D tried to have sex with her, she submitted. The Court of Appeal held there was a difference between real consent and mere submission.
Consent was given to sexual intercourse without knowledge of the fact that D was HIV positive. The Court of Appeal held that there was no consent to the risk of the infection.
The court held that ordinary 'jostlings' of everyday life were not battery. Sports injuries during properly conducted games and sports also fall into this category.
D made a tackle on the victim during an amateur football game. The Court of Appeal said that where an injury is caused during a match, a criminal prosecution should be kept for those situations where the conduct was sufficiently bad to be properly categorised as criminal.
Consent is not a defence to a s47 Offences Against the Person Act 1861 offence (ABH) unless it falls within one of the exceptions listed in Attorney General's Reference (No. 6 of 1980) (1981)
Attorney General's Reference (No. 6 of 1980) (1981)
The Court of Appeal held that consent could not be a defence to two men fighting in the street to settle their differences as it was not in the public interest.
The House of Lords held that consent was not a defence to gay sadomasochistic acts, even though they were all adults and the injuries inflicted were minor.
The Court of Appeal held that, where D had branded his initials on his wife's bottom with a hot knife at her request, this was not an unlawful act, even though she had to have medical treatment for the burns caused.
Two boys aged 14 and 15 were thrown into the air by older boys. The court decided that a genuine mistaken belief in consent could be a defence and that this fell into the recognized exception of rough horseplay.
If a terminally ill person wants to die, they must take their own life. If anyone kills them, it is murder. Even if someone helps them to take their own life, that person is guilty of the offence of assisting suicide.