But For Test CASES

In English law, the “but for” test is the primary method of establishing factual causation. It asks whether the claimant’s harm would have occurred but for the defendant’s wrongful act or omission. If the harm would have happened anyway, causation is not established.

Definition and Principles

The test isolates the defendant’s conduct as a necessary condition of the claimant’s loss. It distinguishes between events caused by the defendant and those that would have occurred regardless of their actions.

Requirements for Establishing

• Wrongful act or omission: The defendant must have breached a duty or committed a wrongful act.
• Factual causation: The harm must not have occurred without that breach or act.
• Limitations: The test may be inadequate in cases of multiple causes or uncertainty.
• Further control: Legal causation and remoteness are applied after factual causation is established.

Practical Applications

The test was confirmed in Barnett v Chelsea and Kensington Hospital (1969), where negligence by a hospital did not cause death because the patient would have died regardless. Modifications apply in complex causation cases, such as Fairchild v Glenhaven Funeral Services (2002).

Importance

The “but for” test provides a straightforward starting point for causation analysis. While not sufficient in all cases, it ensures liability is linked to conduct that actually made a difference to the claimant’s harm.