Workplace Stress in UK Law

It is a non sequitur to say that because an employer is under a duty to an employee not to cause him physical injury, the employer should as a necessary consequence of that duty (of which there is no breach) be under a duty not to cause the employee psychiatric injury: see Hilson, Nervous Shock and Categorization of Victims, [1998] Tort L.R. 37, at 42. The rules to be applied when an employee brings an action against his employer for harm suffered at his workplace are the rules of tort.

Whichever is the correct analysis, the threshold question is whether this kind of harm to this particular employee was reasonably foreseeable. It may be that he knows, as in Paris, or ought to know, of a particular vulnerability; but he may not. Because of the very nature of psychiatric disorder, as a sufficiently serious departure from normal or average psychological functioning to be labelled a disorder, it is bound to be harder to foresee than is physical injury.

All of this points to there being a single test: whether a harmful reaction to the pressures of the workplace is reasonably foreseeable in the individual employee concerned. Such a reaction will have two components: (1) an injury to health; which (2) is attributable to stress at work.

It will be easier to conclude that harm is foreseeable if the employer is putting pressure upon the individual employee which is in all the circumstances of the case unreasonable. Also relevant is whether there are signs that others doing the same work are under harmful levels of stress.

Here again, it is important to distinguish between signs of stress and signs of impending harm to health. Stress is merely the mechanism which may but usually does not lead to damage to health. If the employee or his doctor makes it plain that unless something is done to help there is a clear risk of a breakdown in mental or physical health, then the employer will have to think what can be done about it.

Harm to health may sometimes be foreseeable without such an express warning.

It is essential, therefore, once the risk of harm to health from stresses in the workplace is foreseeable, to consider whether and in what respect the employer has broken that duty. There may be a temptation, having concluded that some harm was foreseeable and that harm of that kind has taken place, to go on to conclude that the employer was in breach of his duty of care in failing to prevent that harm (and that that breach of duty caused the harm).