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Learning outcomes
What you will learn
- 01
Explain why actus reus means more than a literal 'guilty act'.
- 02
Separate conduct, circumstance and result elements within an offence.
- 03
Explain why criminal conduct must ordinarily be voluntary.
- 04
Recognise when causation becomes necessary because an offence requires a prohibited result.
Lightbulb Law Briefing Note
The episode, distilled.
The brief
Actus reus is a convenient label for the external elements of an offence. Those elements vary: one offence may focus on conduct, another on a circumstance, another on a prohibited consequence, and many combine more than one.
Movement is not always conduct
If Maya is pushed into a glass panel, her body causes the impact but the movement is not a product of her choice. Criminal law ordinarily requires voluntary conduct, although the wider facts — including an earlier voluntary act — may still matter.
Take the definition apart
Do not begin with the drama of the facts. Begin with the legal definition. Identify the conduct required, the circumstances that must exist, and any prohibited result that must follow.
Result crimes lead to causation
Where the offence requires a result such as death or damage, proving conduct alone is insufficient. The prosecution must also connect the defendant's conduct to that consequence in law.
The framework
Key points
Actus reus refers broadly to external offence elements, not one universal type of act.
Conduct is ordinarily required to be voluntary.
Circumstance elements are facts that must exist even though the defendant does not 'do' them.
Result crimes require the prohibited consequence and legal causation.
Every element required by the offence must be proved.
Authorities
Key cases
Legislation & rules
Key statutory material
Flip the cards
Retrieve, do not just reread.
Try to answer each prompt before revealing the back of the card.
Quick Check
Test the connection.
Question 1
Maya is pushed into a glass panel and it breaks. Which issue should be identified first?
Question 2
Which is a circumstance element rather than conduct?
Question 3
Why can a missed hammer swing matter differently from a broken window?
Your Lightbulb Law Moment
Notice what has just clicked.
The phrase 'guilty act' can mislead. The real skill is to take the offence apart and ask: what conduct, what circumstances, what result — and has each been proved?
Pause before moving on.
Choose any familiar offence. Can you separate its external ingredients into conduct, circumstance and result without yet discussing the defendant's state of mind?
Downloadable support
Useful on paper, not designed as a content dump.
Selected printable companions use the restrained Lightbulb Law house style, with Times New Roman, black-and-white layouts and generous space for annotation.
Accuracy note
Current-law companion checked against the Theft Act 1968, Criminal Damage Act 1971 and the current criminal-law framework on 17 September 2026.