Legal Case Summary
Cassidy v Ministry of Health [1951] 2 KB 343
TORT – VICARIOUS LIABILITY – EMPLOYER’S RELATIONSHIP WITH THE PRIMARY TORTFEASOR
Facts
The claimant was a patient at a hospital run by the defendant who required routine treatment to set the bones in his wrist. Due to negligence on the part of one of the doctors, the operation caused his fingers to become stiff. The claimant sued the defendant in the tort of negligence on the basis of vicarious liability.
Issues
If negligence is proven against a primary tortfeasor, it is sometimes possible to hold their employer liable under the doctrine of vicarious liability. This doctrine holds that an employer is legally responsible for torts committed by their ‘servants’ in the course of their employment. The equivalent term under modern law would be ‘employee’. At the time, the dominant test for determining whether the primary tortfeasor was a servant was whether the defendant had control over how they performed their services.
The defendant argued that the doctor responsible for the negligence was not one of their servants, as they had no control over how he performed his job.
The issue was the meaning of ‘servant’ in the context of vicarious liability.
Decision/Outcome
The Court of Appeal held that the defendant was vicariously liable.
The fact that the worker engages in specialised and technical work for which he is specially qualified does not mean that he is necessarily not a servant. The Court held that a person is a servant of the defendant if he was chosen for the job by the defendant and is fully integrated into the defendant’s organisation.
In this case, the doctors were appointed to the hospital by the defendant and not chosen by the patient, and were fully integrated into the hospital. They were therefore the defendant’s servants.
Updated 19 March 2026
This case summary accurately states the facts, issues, and outcome of Cassidy v Ministry of Health [1951] 2 KB 343 as decided by the Court of Appeal. The case remains good law and is still routinely cited as an important authority on vicarious liability in the employment context, particularly regarding the test for ‘servant’ status in respect of professional or skilled workers such as hospital doctors.
Readers should be aware, however, that the law of vicarious liability has developed significantly since 1951. The ‘control’ test and ‘integration’ test discussed in the article are now part of a broader, multi-factorial analysis. In particular, the Supreme Court in Various Claimants v Catholic Child Welfare Society [2012] UKSC 56 and subsequently in Cox v Ministry of Justice [2016] UKSC 10 reformulated the test for vicarious liability, emphasising a two-stage approach: first, whether the relationship between the defendant and the tortfeasor is one capable of giving rise to vicarious liability; and second, whether there is a sufficient connection between that relationship and the wrongful act. The Supreme Court in Barclays Bank plc v Various Claimants [2020] UKSC 13 then clarified that vicarious liability does not extend to genuinely independent contractors. Most recently, the Supreme Court in Various Claimants v Barclays Bank and the linked appeal Trustees of the Barry Congregation of Jehovah’s Witnesses v BXB [2023] UKSC 15 has continued to refine these principles. The outcome in Cassidy itself would almost certainly be the same under the modern framework, but students should treat the article as an introduction to the historical development of the doctrine rather than a complete statement of the current law.
