## Facts

- Denton, the defendant, set fire to a cotton mill.
- Denton claimed he believed he had the owner's consent to commit the arson and stated the owner proposed burning the mill to fraudulently claim insurance money.
- At trial, the judge instructed the jury that an honest belief in consent could serve as a defence, regardless of whether that belief was reasonable.
- The correctness of this instruction was subsequently reviewed by the Court of Appeal.

## Issues

1. Whether an honest but unreasonable belief in consent is sufficient to constitute a defence in criminal law.
2. Whether the legal test for belief in consent should be subjective (focusing on the defendant's actual belief) or objective (requiring reasonableness).
3. What limits apply to the defence of honest belief in consent, and its application in future cases.

## Decision

- The Court of Appeal affirmed the trial judge’s instruction that an honestly held belief in consent is a valid defence, even if the belief is unreasonable.
- The court determined that the honesty of the belief, rather than its reasonableness, is the key legal requirement.
- The subjective test applies: the focus is on the defendant’s actual state of mind.
- The reasonableness of the belief remains relevant only to weigh the credibility of the defendant's assertion, but is not a requirement for the defence to succeed.

## Legal Principles

- The defence of honest belief in consent is judged subjectively, considering the defendant’s true mental state rather than what a reasonable person would have believed.
- Reasonableness is not a legal requirement for this defence, but may be relevant to assessing the truthfulness of the alleged belief.
- The honest belief must pertain to the specific act in question and does not apply to strict liability offences.
- Evidence indicating the defendant ignored or disregarded the lack of consent may undermine the defence.
- Later cases, such as R v B (2006) EWCA Crim 2945, have confirmed the subjective test from R v Denton, stressing that the belief must be genuinely held and not fabricated post hoc.
- Consideration is required as to how mental disorders may affect the genuineness of such belief.

## Conclusion

R v Denton solidified the principle that an honestly held belief in consent constitutes a valid defence, even if unreasonable, provided that belief genuinely existed. The case established a subjective test for this defence, influencing subsequent developments in the law on consent and mens rea in criminal offences.


R v Denton [1982] 1 All ER 65