## Facts

- The defendant, Mr. Miller, was a squatter who had consumed alcohol and fell asleep in a building while holding a lit cigarette.
- The cigarette ignited the mattress on which Miller was sleeping, causing a fire.
- Upon waking and becoming aware of the fire, Miller moved to another room and went back to sleep without attempting to extinguish the fire or seek help.
- The fire spread, resulting in extensive damage exceeding £800.
- Miller was charged with arson under the Criminal Damage Act 1971, found guilty at trial, and appealed to the House of Lords.

## Issues

1. Whether an omission to act, following the creation of a dangerous situation, can constitute the actus reus of arson.
2. Whether Miller’s failure to take steps to prevent the effects of the fire satisfied the requirements for mens rea, particularly recklessness.
3. Whether the concept of a duty of care could arise from Miller’s own actions rather than a pre-existing relationship.

## Decision

- The House of Lords held that Miller was criminally liable for arson even though the fire was started unintentionally.
- The court determined that when a person creates a dangerous situation, a duty arises to take reasonable steps to prevent or minimize harm.
- Miller's omission to take such steps after becoming aware of the danger constituted the actus reus of arson.
- The court found that the requisite mens rea of recklessness was satisfied by Miller’s awareness of the risk and failure to act.
- The appeal was dismissed, and the conviction upheld.

## Legal Principles

- Criminal liability may arise from omission if a defendant creates a dangerous situation and fails to act reasonably to prevent harm.
- The actus reus for offences such as arson can be established via omission when accompanied by a duty to act.
- Mens rea in this context includes recklessness, defined by awareness of a risk and unreasonable failure to address that risk.
- The duty of care can be imposed where an individual’s conduct creates the danger, expanding traditional notions of duty beyond pre-existing relationships.

## Conclusion

R v Miller established that a person who creates a dangerous situation can be held criminally liable for the consequences of failing to take reasonable steps to prevent harm, thereby extending liability for omissions in English criminal law. The case clarified that both actus reus and mens rea requirements can be met through a combination of the defendant's initial actions and subsequent omissions when recklessness is present.


R v Miller [1983] 2 AC 161