Factual and Procedural Background
This appeal arises from a claim by the Plaintiff, who suffered asbestosis due to exposure to asbestos dust during his employment as a marine fitter from 1942 to 1981. Approximately half of this exposure, around 12 years, was while employed by the Defendant, with the remainder from other employers under similar conditions. The Plaintiff alleged negligence and breach of statutory duty by the Defendant, who was found liable but only for a portion of the Plaintiff’s injury. The trial judge applied a 25% discount to damages to reflect the Defendant’s share of responsibility. The Plaintiff appealed against this apportionment.
Legal Issues Presented
- Where a claimant suffers injury caused by exposure to a noxious substance from multiple tortfeasors, is a defendant liable for the whole resulting disability if their tortious act materially contributed, subject only to rights against other tortfeasors?
- Or is the defendant liable only to the extent of their contribution to the disability?
- What is the correct approach to the burden of proof and pleading regarding apportionment of liability among multiple tortfeasors in cases of cumulative disease?
Arguments of the Parties
Appellant's Arguments
- The judge erred procedurally by making a deduction without the Defendant pleading that it was only responsible for a proportion of the Plaintiff’s disability.
- The burden of proving apportionment or contribution by other tortfeasors rests on the Defendant, and thus no deduction should have been made.
- As a matter of principle, once the Plaintiff proves the Defendant’s conduct materially contributed to the disease, the Plaintiff is entitled to recover full damages from that Defendant.
- The Defendant should be left to seek contribution from other tortfeasors.
- The judge’s 25% deduction was unsupported by evidence and unjustified.
Respondent's Arguments
The opinion does not contain a detailed account of the Respondent’s legal arguments beyond the judge’s findings and submissions referenced during the hearing.
Table of Precedents Cited
| Precedent |
Rule or Principle Cited For |
Application by the Court |
| Bonnington Castings Ltd v Wardlaw [1956] AC 613 |
Proof of causation requires the claimant to show that the defendant’s breach materially contributed to the injury; liability is for the whole injury, leaving contribution issues between tortfeasors. |
The court confirmed that causation burden lies with claimant; however, liability extent was not considered in Bonnington as defendants denied liability entirely. |
| McGhee v National Coal Board [1973] 1 WLR 1 |
Material increase in risk due to negligence is sufficient to establish causation; burden remains on claimant. |
Reinforced Bonnington’s approach; extent of liability not addressed as defendants denied causation. |
| Wilsher v Essex Health Authority [1988] AC 1074 |
Affirmed that burden of proving causation lies with claimant; no new principle introduced by McGhee. |
Used to confirm claimant’s burden of proof on causation. |
| Milner v Humphreys and Glasgow Ltd (unreported, 1998) |
Where disease is caused by sequential exposure, defendant liable only for part attributable to them; burden of proof on defendant to plead and prove apportionment. |
Supported view that defendants must plead apportionment; injury not truly indivisible in sequential exposure cases. |
| Borel v Fibreboard Paper Products Corp (1973) 493 F.2d 1076 (US) |
Where multiple defendants cause harm, burden shifts to each defendant to show their portion; joint and several liability applies if no apportionment can be shown. |
Cited as supporting a just approach where defendants bear burden of apportionment; court expressed reservations about fairness among defendants. |
| Thompson v Smiths Shiprepairers [1984] 1 QB 405 |
In cases of sequential exposure, court should make best estimate of apportionment; precise quantification not required; liability limited to defendant’s contribution. |
Adopted approach of apportionment based on evidence and common sense; supports partial liability rather than full joint and several liability. |
| Dingle v Associated Newspapers [1961] 2 QB 188 |
Where injury is indivisible, tortfeasor liable for whole injury; tortfeasors sort contributions among themselves. |
Used to explain principle underlying Bonnington; relevant to distinction between indivisible and divisible injuries. |
Court's Reasoning and Analysis
The court examined the nature of causation and liability in cases where injury results from cumulative exposure to harmful substances by multiple tortfeasors. It acknowledged that the burden of proving causation lies with the claimant, who must show that the defendant’s tortious conduct materially contributed to the injury. However, unlike cases involving indivisible injuries, the court recognized that diseases caused by sequential exposure, such as asbestosis, are divisible in nature because the injury progresses cumulatively over time.
The trial judge had applied a 25% deduction to damages to reflect the Defendant’s share of responsibility based on the proportion of exposure. The court found this approach to be reasonable and supported by expert evidence, including that of medical witnesses and academic commentary. It rejected the appellant’s procedural argument that the Defendant was required to plead apportionment, holding that while desirable, strict pleading was not necessary provided the issue was raised and dealt with in evidence.
Regarding the burden of proof on apportionment, the court noted a divergence of views among the judges. One view, consistent with prior House of Lords authorities, held that the claimant must prove causation but the defendant is liable only for their contribution, with the burden on the defendant to plead and prove apportionment if they wish to limit liability. The alternative view, supported by some authorities and the US precedent in Borel, suggested that once the claimant proves material contribution, the defendant is liable for full damages unless they prove the extent of others’ contributions.
Ultimately, the court emphasized that in practice these cases require the court to make the best estimate of liability based on all evidence, applying common sense and fairness rather than rigid rules on burden of proof. The judge’s quantification and discount were upheld as a balanced and just approach to apportionment in complex cumulative injury cases.
Holding and Implications
The court DISMISSED THE APPEAL, affirming the trial judge’s decision to reduce damages by 25% to reflect the Defendant’s proportionate contribution to the Plaintiff’s asbestosis.
The direct effect is that the Defendant remains liable only for their share of the injury, with damages adjusted accordingly. No new legal precedent was established, but the judgment confirms the approach that in cumulative disease cases involving sequential exposure, liability and damages should be apportioned based on the best evidence of contribution. The court also clarified the procedural flexibility regarding pleading apportionment and the practical approach to burden of proof in such cases.