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. Under the club rules she accepted on becoming treasurer, she must bank the subscriptions into the club's dedicated account within seven days. One month she receives £200 in subscriptions and spends the cash on her own gas bill that same day. She intends to replace the money from her wages before anyone notices, and pays an equivalent £200 into the club account two weeks later. Which statement best explains how section 5(3) of the Theft Act 1968 applies to the subscriptions when she pays the gas bill?

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