Imperial Chemical Industries Ltd v Shatwell

Factual and Procedural Background

On 8 June 1960, an accidental explosion occurred in a quarry owned by Company A. The blast seriously injured two qualified shot-firers: Plaintiff and Plaintiff’s Brother. The pair, together with a third shot-firer, had prepared fifty shot holes and inserted electric detonators connected in series. Statutory regulations and Company A’s explicit instructions required that continuity testing of the circuit be carried out from a shelter some 80 yards away. Lacking sufficient wire, the third worker left to fetch more. Impatient, Plaintiff proposed testing in the open; Plaintiff’s Brother agreed.

The initial test revealed a fault. Instead of waiting for the proper equipment, both men began individual testing of each detonator while still exposed. Plaintiff applied the galvanometer to the first detonator, triggering the explosion that injured them both. Plaintiff sued Company A, asserting vicarious liability for Plaintiff’s Brother’s alleged negligence and breach of statutory duty. The trial court awarded Plaintiff half of his proven loss (£1,500) after finding equal fault. The Court of Appeal affirmed. Company A appealed to the House of Lords.

Legal Issues Presented

1. Whether Plaintiff’s Brother’s conduct was a legal cause of Plaintiff’s injuries, thereby engaging Company A’s vicarious liability.
2. Whether the defence of volenti non fit injuria (voluntary assumption of risk) barred Plaintiff’s claim, notwithstanding a breach of statutory regulations imposed on shot-firers personally.

Arguments of the Parties

Company A’s Arguments

• Plaintiff’s Brother’s actions were not a causative factor; Plaintiff’s own conduct was the sole cause.
• Both employees knowingly and voluntarily assumed the risk of testing in the open; therefore, volenti non fit injuria provided a complete defence.
• The statutory duty was imposed directly on the shot-firers, not on Company A; consequently, breach of that duty could not nullify the volenti defence.

Plaintiff’s Arguments

• Plaintiff’s Brother’s participation and agreement were sufficient causal factors under the reasoning in Stapley v. Gypsum Mines Ltd.
• Plaintiff lacked full appreciation of the risk; the explosion was regarded as highly unlikely.
• Established authority (Baddeley v. Earl Granville; Wheeler v. New Merton Board Mills Ltd.) precluded reliance on volenti non fit injuria where injury followed a breach of statutory duty.

Table of Precedents Cited

Court’s Reasoning and Analysis

The House of Lords unanimously allowed the appeal. Key steps in the analysis included:

• Causation. Applying Stapley, the Court accepted that Plaintiff’s Brother’s collaboration had some causal connection. However, causation alone did not establish liability because other defences remained.
• Voluntary Assumption of Risk. Both employees were qualified, fully informed of Company A’s orders and the new statutory regulations, and knew that testing in the open was forbidden. Plaintiff admitted impatience was his only motive. The Court found that Plaintiff freely consented to the risk; economic or managerial pressure was absent.
• Statutory Duty Argument. The pertinent regulation imposed duties directly on shot-firers, not on Company A. Prior authorities barring volenti where employers breach duties (Baddeley, Wheeler) did not apply because Company A was blameless and had actively enforced compliance.
• Policy Considerations. Imposing liability on an innocent employer despite exhaustive safety measures would undermine workplace discipline and remove incentives for employees to follow safety rules.
• Distinguishing Precedents. The Court emphasised that Stapley dealt solely with causation and did not consider volenti. Accordingly, it did not preclude the defence here.

Holding and Implications

APPEAL ALLOWED. Judgment for Plaintiff was set aside, and Company A was absolved of liability.

Implications: The decision confirms that volenti non fit injuria remains a complete defence in employer-employee cases where (1) the employer is not personally in breach of statutory or common-law duties and (2) the employee freely and knowingly embarks on a prohibited, risky course of conduct. It limits the reach of Stapley v. Gypsum Mines Ltd. and clarifies that statutory duties imposed on employees do not automatically negate the volenti defence.