Dunnage v Randall [2015] EWCA Civ 673
Facts
Mr Dunnage tried to intervene when his uncle, Mr Randall, poured petrol over himself during a severe episode of mental illness. A fire followed, killing the uncle and seriously burning Mr Dunnage. The evidence indicated florid paranoid schizophrenia and profoundly impaired rational decision-making. The claim required the court to decide whether that condition removed negligence responsibility for the acts which caused the fire. Insurance coverage was also in issue. The first-instance decision rejected liability, and Mr Dunnage appealed, arguing that the ordinary objective standard should apply despite his uncle's illness.
Legal Issue
Did the uncle’s severe mental illness lower the objective standard of care or make his conduct wholly involuntary, preventing negligence liability for the injuries caused by the fire?
Held
The Court of Appeal allowed the injured nephew's appeal. Severe mental illness did not justify assessing the uncle's dangerous conduct by a generally reduced personal standard of care. The objective standard protects those injured by the defendant's acts. The court distinguished circumstances in which a condition entirely removes responsibility for conduct from those in which illness impairs rational decision-making but the person still carries out the relevant acts. The case should therefore not be summarised as saying that mental illness is irrelevant to every negligence issue. Its central conclusion concerns the objective standard and the demanding threshold for treating the conduct as wholly involuntary.
⭐ Legal Principle
Mental illness does not generally lower the objective standard of reasonable care owed to others. Dunnage distinguishes impaired reasoning from medical incapacity which wholly eliminates responsibility for the conduct. The nature and effect of the condition require careful factual assessment.
Significance
Dunnage highlights the distinction between moral blame and civil responsibility for causing injury. The court's objective approach protects an innocent claimant even where the defendant's illness makes their behaviour understandable in clinical terms. It should be compared with cases involving an unforeseeable physical incapacity rather than treated as proof that every medically affected act is negligent. The defendant's control over the physical acts remained important to that distinction.
Common exam questions about this case
Does a diagnosis itself lower the negligence standard?
No. Dunnage applies an objective standard and does not tailor it generally to the defendant's impaired reasoning. The diagnosis is relevant to understanding what happened, but it does not automatically excuse dangerous conduct. The court must distinguish impaired choice from a condition which wholly eliminates responsibility.
Why is involuntariness different from unreasonable decision-making?
A person may make profoundly irrational choices because of illness while still performing the acts that cause injury. Entirely involuntary conduct raises a different question about whether the act can be attributed to the person at all. Dunnage warns against treating those categories as interchangeable.
Is the case a finding that people with mental illness are always liable?
No. Liability still requires the ordinary negligence elements, and the effect of a particular incapacity matters. The decision rejects a generally reduced standard, not all possible arguments concerning involuntariness, foreseeability or causation. An answer must address the actual condition and conduct rather than the diagnostic label alone.