Henderson v Dorset Healthcare University NHS Foundation Trust [2018] EWCA Civ 1841
Facts
Henderson experienced a serious psychotic episode while under the care of a mental-health service. She killed her mother and was convicted of manslaughter by reason of diminished responsibility. The trust admitted negligent failures in responding to her deterioration. Henderson sought damages for consequences of the killing and her resulting detention in hospital. The trust argued that illegality barred those heads of loss. The Court of Appeal had to consider the effect of earlier decisions, particularly Clunis and Gray, on a claim arising from an admitted failure of psychiatric care.
Legal Issue
Was the Court of Appeal bound to reject damages for the consequences of Henderson's manslaughter and detention despite the trust's admitted negligence?
Held
The Court of Appeal dismissed Henderson's appeal. It regarded the relevant circumstances as materially indistinguishable from the binding authorities in Clunis and Gray. Those authorities prevented recovery of the losses claimed as consequences of the claimant's serious criminal act and the ensuing detention.
The fact that the trust's negligence contributed to the circumstances did not allow the Court of Appeal to disregard those rules. Henderson's conviction involved diminished responsibility, rather than a finding that she bore no criminal responsibility at all. This record concerns the 2018 appeal. The Supreme Court subsequently affirmed the result in 2020 and considered whether the earlier authorities remained consistent with Patel v Mirza.
⭐ Legal Principle
The Court of Appeal applied Clunis and Gray to bar recovery of losses arising from Henderson's manslaughter and detention. The Supreme Court later affirmed the approach in [2020] UKSC 43, holding the relevant illegality rule consistent with Patel v Mirza.
Significance
Henderson demonstrates the continuing importance of Gray in negligence claims connected with a claimant's serious criminal act. The 2018 judgment also illustrates the Court of Appeal's obligation to apply binding precedent. Its later Supreme Court history should be stated separately, rather than attributed to the earlier court. Students should distinguish diminished responsibility from legal insanity and identify which claimed losses arise from the crime or its consequences.
Common exam questions about this case
Why did admitted negligence not establish entitlement to every claimed loss?
The trust's negligent care was only part of the analysis. The losses in issue also arose from a killing for which Henderson had been held criminally responsible and from the resulting detention. The Court of Appeal applied binding illegality authorities to those consequences despite the admitted breach of duty.
Why does the distinction between diminished responsibility and insanity matter?
Diminished responsibility reduced the homicide offence to manslaughter but did not eliminate criminal responsibility. The court therefore considered the civil claim against the background of that conviction. It would misstate the case to describe Henderson as acquitted by reason of insanity or as having no legal responsibility for the killing.
What did the later Supreme Court appeal add?
The Supreme Court affirmed the result in 2020 and examined whether Gray should be departed from after Patel v Mirza. It held that the relevant approach remained consistent with Patel. Those later reasons support the case's current significance but should not be presented as words of the 2018 Court of Appeal.