Criminal Law

Criminal law is the state's most serious power turned on its own citizens: the power to censure and punish. Everything in the subject flows from that seriousness. Because conviction carries public condemnation and the possibility of prison, the law insists that the prosecution prove, beyond reasonable doubt, both a prohibited act and a guilty state of mind — and it spends most of its energy defining those two requirements precisely, offence by offence, so that punishment tracks genuine fault rather than bad luck or bad character.

The subject therefore trains a particular discipline: taking a messy human story and asking, for each person in it, exactly which offence is in play, whether each element of that offence can be proved against them on these facts, and whether any defence answers it. That structure — elements, proof, defences, one defendant at a time — is the whole method, and it is what your exam rewards.

Actus reus — the conduct element

Every offence specifies things that must exist in the world: conduct, sometimes circumstances (the property "belongs to another"), sometimes consequences (a death). The conduct must be voluntary in the minimal sense of a willed bodily movement — spasms and reflexes are not acts. English law generally punishes acts, not failures to act: there is no general duty to rescue. Omissions ground liability only where a recognised duty exists — statute, contract (Pittwood, the level-crossing keeper), a relationship such as parent and child, a voluntarily assumed care of another (Stone and Dobinson), or the defendant's own creation of a dangerous situation (Miller, the smouldering mattress).

Mens rea — the fault element

Each offence names the state of mind that must accompany the conduct. Intention is primarily its ordinary meaning: aim or purpose. Where a result was not the defendant's purpose, Woollin permits — not requires — a jury to find intention where the result was virtually certain and the defendant appreciated as much: so-called oblique intention. Recklessness is the conscious taking of an unjustified risk, judged subjectively: the defendant must actually have foreseen the risk (Cunningham), a position the House of Lords restored for criminal damage in G [2003] after two decades of an objective test. Negligence — falling below the reasonable person's standard — plays a smaller role, chiefly in gross negligence manslaughter. Transferred malice moves intent from the intended victim to the actual one within the same offence. And actus reus and mens rea must coincide in time — a requirement the courts satisfy generously, through continuing acts (Fagan) and single transactions (Thabo Meli).

Causation

Result crimes require the defendant's conduct to have caused the result. Factual causation is the but-for test; legal causation asks whether the conduct was a substantial and operating cause, and whether any novus actus interveniens broke the chain. Under the thin skull rule, victims are taken as found — frailty, and by Blaue, beliefs too. Negligent medical treatment rarely breaks the chain (Cheshire); a victim's free, deliberate and informed act does (Kennedy (No 2), the self-injection case).

Homicide

Murder is unlawful killing with malice aforethought — intention to kill or to cause grievous bodily harm — and the mandatory life sentence explains much of the doctrinal pressure elsewhere. Two partial defences — the pair your year concentrates on — reduce murder to voluntary manslaughter: loss of control (Coroners and Justice Act 2009, replacing the old provocation defence) and diminished responsibility (Homicide Act 1957, as amended — an abnormality of mental functioning from a recognised medical condition, substantially impairing the defendant's ability to understand their conduct, form a rational judgment or exercise self-control). Involuntary manslaughter covers unintended killings, by two main routes: unlawful act manslaughter — a criminal, dangerous act causing death, dangerous meaning sober and reasonable people would recognise a risk of some harm (Church) — and gross negligence manslaughter, where breach of a duty of care is so bad as to be criminal (Adomako).

Non-fatal offences and consent

A ladder of offences runs from assault (causing apprehension of immediate unlawful force) and battery (applying it), through assault occasioning actual bodily harm, to maliciously wounding or inflicting grievous bodily harm and, at the top, wounding or causing grievous bodily harm with intent to cause it — the main statutory rungs being sections 47, 20 and 18 of the Offences Against the Person Act 1861. Consent is a genuine defence to common assault, but as a rule not to actual bodily harm or worse unless the activity falls within recognised exceptions — sport, surgery, tattooing among them. Brown is the controversial centre of that rule.

Theft

Theft is the dishonest appropriation of property belonging to another with the intention of permanently depriving them of it — five elements, each defined in the Theft Act 1968. Two are where the action is. Appropriation means assuming any right of an owner, and is astonishingly wide: it can be satisfied even by accepting a valid gift (Hinks). That width throws the whole weight onto dishonesty, which since Ivey is assessed by the standards of ordinary decent people, applied to the facts as the defendant knew or believed them — with no further requirement that the defendant realised those standards condemned it.

General defences

Defences either deny responsibility or justify the act. Insanity under the M'Naghten Rules requires a defect of reason from a disease of the mind. Voluntary intoxication is no defence to crimes of basic intent, though it may negate the mens rea of specific-intent crimes (Majewski). Duress excuses crimes committed under threat of death or serious injury, within strict limits — never murder, and not where the defendant voluntarily ran the risk of compulsion by associating with criminals, whether they actually foresaw the coercion or merely should have (Hasan). Self-defence permits reasonable force judged on the facts as the defendant believed them.

Liability beyond the completed offence

Criminal law reaches back before completion and outward beyond the principal. The inchoate offences — attempt (an act more than merely preparatory), conspiracy, and encouraging or assisting — criminalise steps towards crime. Accessory liability attaches to those who intentionally assist or encourage the principal's offence; since Jogee, the accessory must intend to assist or encourage the crime, and mere foresight that a confederate might commit it is evidence of that intent, not a substitute for it.

These are the places where the law is unsettled, criticised, or split — which makes them exactly where essays and first-class problem answers are won.

• What is intention, really? Woollin deliberately stopped short of defining it: virtual certainty is something from which a jury "may" find intention. Is that a welcome grant of moral elbow-room to juries, or an unprincipled gap in the most serious offence we have? Academics divide; so do judges.
• Omissions. Why is there no general duty of easy rescue? The duty categories are historical accidents as much as principle, and the act/omission line itself can be manipulated by description. The area is standard essay territory precisely because the orthodox position is defensible and uncomfortable at once.
• Causation and autonomy. Kennedy (No 2) makes the victim's free and informed choice a chain-breaker. But how free is the choice of an addict? The courts' commitment to autonomy here sits awkwardly with the paternalism of Brown — noticing that tension is first-class material.
• Consent. Brown asks how far the criminal law may police consensual private harm, and its three-to-two split maps the live positions: legal moralism and protection on one side, autonomy on the other. The recognised exceptions (sport, surgery, body art) resist principled explanation, which critics say gives the game away.
• Dishonesty after Ivey. Whose standards are "ordinary decent" standards, and does a purely objective test risk convicting the naïve? The change was made in a civil case about a card player and confirmed for crime later — the manner of the change is itself debated.
• Joint enterprise after Jogee. The Supreme Court said the law had taken a wrong turning three decades earlier. Campaigners hoped for many quashed convictions; the strict approach to out-of-time appeals meant few. Whether the correction changed outcomes or only doctrine is a genuinely open question.
• The gross negligence circle. Adomako tells juries that negligence is criminal when it is bad enough to be criminal. The circularity is acknowledged — the question is whether any better test is available, or whether jury standards are doing legitimate work.
• Loss of control. Parliament excluded sexual infidelity as a qualifying trigger, and the courts have had to decide what to do when it arrives mixed with other triggers. The defence's boundaries — and its gendered history and effects — are heavily written about.

Not a case list — a working set. Know what each of these is for, and note the two marked corrections: much older material online still states the superseded law.

• Woollin — oblique intention: virtual certainty appreciated by the defendant lets a jury find intent.
• Cunningham — recklessness means actual foresight of the risk.
• G [2003] — recklessness is subjective; the objective Caldwell experiment overruled.
• Miller — creating a danger generates a duty to act on it.
• Stone and Dobinson — voluntarily assuming care of a dependant creates a duty.
• Blaue — take your victim as you find them, beliefs included.
• Cheshire — poor medical treatment rarely relieves the attacker of causal responsibility.
• Kennedy (No 2) — a victim's free, deliberate, informed act breaks the causal chain.
• Fagan — a continuing act lets later mens rea complete the offence.
• Thabo Meli — coincidence satisfied across a planned series of acts.
• Church — "dangerous" in unlawful act manslaughter is what sober and reasonable people would recognise.
• Adomako — the four-stage test for gross negligence manslaughter.
• Brown — consent is generally no defence to actual bodily harm and above.
• Hinks — even a valid gift can be "appropriated"; theft leans on dishonesty.
• Ivey — correction: dishonesty is now objective, judged on the defendant's actual view of the facts. It displaced the two-stage Ghosh test; anything teaching Ghosh's "would the defendant realise ordinary people would call it dishonest?" limb is out of date.
• Jogee — correction: it re-set accessory liability. Foresight that your confederate might commit the further offence is evidence of intent, not liability by itself; the Chan Wing-Siu "parasitic accessory" doctrine it replaced still haunts older notes and videos.
• Hasan — duress is tightly limited and lost by voluntary criminal association.
• Majewski — the basic/specific intent structure for intoxication.
• The M'Naghten Rules — the Victorian framework that still defines insanity: defect of reason, disease of the mind, not knowing the act's nature or wrongness.

Terms that look like English but carry technical loads. When one of these appears dotted-underlined in the text above, tap it for the definition in place.

Actus reus

The external elements of an offence: conduct, circumstances, consequences. Not just "the act".

Mens rea

The fault element an offence requires — intention, recklessness, knowledge, negligence. Not "evil mind".

Oblique intention

Intention found (not presumed) from foresight of a virtually certain result.

Recklessness

Consciously running an unjustified risk. Subjective: the defendant must have seen the risk.

Malice aforethought

Murder's mens rea: intention to kill or cause GBH. Needs neither malice nor forethought.

Transferred malice

Intent aimed at one victim applies to the person actually harmed, within the same offence.

Novus actus interveniens

An intervening act — of the victim or a third party — sufficient to break the chain of causation.

Thin skull rule

You take your victim as you find them: unusual vulnerability never reduces liability.

Voluntary manslaughter

Murder reduced by a partial defence — loss of control or diminished responsibility.

Involuntary manslaughter

Killing without murderous intent: the unlawful-act and gross-negligence routes.

GBH / ABH

Grievous bodily harm means really serious harm; actual bodily harm is any hurt interfering with health or comfort more than trivially.

Appropriation

Assuming any right of the owner — far wider than taking.

Dishonesty

Judged by ordinary decent standards on the facts as the defendant believed them (Ivey).

Duress

Committing a crime under threat of death or serious injury. An excuse, tightly confined; never for murder.

Inchoate offence

An offence of trying, agreeing, or encouraging — complete though the target crime never happens.

Principal / accessory

The principal commits the offence; an accessory intentionally assists or encourages it and is tried as if a principal.

Basic / specific intent

The intoxication divide: roughly, offences satisfiable by recklessness against those requiring intention.

Strict liability

An offence element requiring no mens rea at all — common in regulatory crime, exceptional elsewhere.

Openly published, deliberately. If you can answer these without notes, the module's architecture is in place. Each reveal describes what a good answer contains — not a script to memorise.

Why did the House of Lords in Woollin refuse to say that foresight of virtual certainty is intention — and what does the refusal preserve?

The distinction between a rule of substantive law and a rule of evidence: virtual certainty appreciated by the defendant is the material from which a jury is entitled to find intention, not a state of affairs that automatically constitutes it. A good answer explains what the refusal preserves — the jury's latitude in morally freighted borderline cases (the doctor, the desperate parent) — and acknowledges the cost: uncertainty at the heart of murder. The strongest answers can say which side of that trade they find defensible, and why.

A stranger watches a child drown in shallow water and walks on. Miller watched his own mattress smoulder and moved rooms. Why is one criminally liable and not the other?

The omissions architecture: no general duty of rescue, so liability needs a recognised duty source — and Miller had one, having created the danger himself. A good answer names the duty categories, places Miller within them, and shows the stranger falls outside all of them. The best answers add a view on whether that line is defensible — the ease-of-rescue argument against, the liberty and line-drawing arguments for — without pretending the law is other than it is.

In Kennedy (No 2) the supplier prepared the syringe and handed it over; death followed in minutes. But-for causation is obvious. Why was he not liable for manslaughter?

Legal causation, not factual, does the work: the deceased's free, deliberate and informed self-injection was an autonomous act that broke the chain. A good answer separates the two causation stages, explains why autonomy carries that weight in the criminal law, and tests the edge — what if the victim was young, or deceived, or an addict in withdrawal? Recognising that "free and informed" is doing contestable work is what lifts the answer.

After Jogee, your client admits she knew her friend "might well" pull the knife. Why is the analysis not over?

Because foresight is now evidence of the accessory's intention to assist or encourage the offence, not a substitute for it. A good answer states what the prosecution must actually prove — intentional assistance or encouragement of the crime, with the required intent — explains the pre-Jogee position it replaced (foresight sufficed under Chan Wing-Siu), and applies it: the jury may infer intent from her foresight and continued participation, but the defence can argue against the inference. Knowing what changed, and what a jury may still do, is the point.

Gemma persuades her elderly neighbour, who trusts her completely, to give her £20,000 as a gift. The gift is valid in civil law. How can this possibly be theft — and should it be?

Hinks: appropriation includes assuming the rights of an owner even with the owner's consent and even under a valid transfer, so everything turns on dishonesty — now the Ivey question of ordinary decent standards applied to what Gemma knew. A good answer works the elements in order, sees that the case stands or falls on dishonesty, and engages the criticism: the criminal law here condemns what the civil law upholds. Is that incoherence, or is criminal law properly policing exploitation the civil law misses? Either view, argued, is first-class material.