FLK2 · Criminal Liability

Actus reus & mens rea

SQE1 revision notes — the key rules, leading cases and common traps for this topic, in plain English and current to 2026.

CRL.01 — Actus Reus & Mens Rea

Core rule. Most offences require coincidence of a guilty act (actus reus) and a guilty mind (mens rea), proved beyond reasonable doubt. The Latin maxim: actus non facit reum nisi mens sit rea — the act alone is not criminal unless the mind is guilty.

Actus reus

The external element: conduct, circumstances, and (for result crimes) consequences. It must be voluntary — Bratty v AG NI [1963].

Omissions. No general duty to act. Liability for failing to act arises only where a duty exists:

Statute (e.g. failing to provide a breath specimen)
Contract — R v Pittwood (1902) (gatekeeper)
Relationship — R v Gibbins & Proctor (1918) (parent/child)
Voluntary assumption of care — R v Stone & Dobinson [1977]
Creating a dangerous situation — R v Miller [1983]
Public office — R v Dytham [1979]

Causation (result crimes): factual ("but for" — R v White [1910]) and legal. Legal cause must be more than minimal (R v Kimsey); defendant need not be the sole cause. Take your victim as you find them (thin-skull rule — R v Blaue [1975], includes beliefs). Breaks in the chain (novus actus): free, voluntary, informed third-party/victim acts, or events that are not reasonably foreseeable. Medical treatment rarely breaks the chain unless "palpably wrong" and independent (R v Cheshire [1991]; R v Jordan).

Mens rea

Intention — direct (aim/purpose) or oblique: jury may find intent where the result was virtually certain and D appreciated this (R v Woollin [1999]; R v Nedrick). Oblique intent is evidential, not a definition.
Recklessness — subjective: D foresaw a risk and unreasonably took it (R v Cunningham [1957]; R v G [2003], which overruled the objective Caldwell test).
Negligence — objective failure to meet the reasonable standard (gross negligence manslaughter).

Traps and distinctions

Coincidence: AR and MR must occur together, but courts treat a continuing act (Fagan v MPC [1969]) or one transaction (Thabo Meli v R [1954]) as concurrent.
Transferred malice: MR transfers between like offences/victims (R v Latimer), not unlike ones (R v Pembliton).
Strict liability: no MR for one or more AR elements (often regulatory); presumption of MR rebutted only by clear statutory intent (Sweet v Parsley [1970]; Gammon factors).
Distinguish R v G (subjective) from the dead Caldwell objective test; don't confuse motive with intention.

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A woman is the treasurer of a small amateur football club. Members pay £20 each month in cash, which the woman is instructed by the club's rules to bank into the club's dedicated account within seven days. One month she receives £200 in subscriptions but, being short of money, uses the cash to pay her own gas bill. She intends to replace the £200 from her wages before anyone notices, and she does in fact pay an equivalent £200 into the club account two weeks later. The woman is charged with theft of the £200. Which of the following is the strongest basis for finding the property belonged to another at the time she used it?

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