"32. … Taking Dr Wear's assessment that the chances of a relapse in 12 months if the marriage had not broken down were 10 to 20% and with a marriage breakdown a proportion of the order of 50%, we find that the chances of a depressive episode occurring (taking into account the chances that there would or would not have been a marriage breakdown) are 33% - i.e. somewhere between the figure of 10% and 50%. This is based on assessment of all the evidence but also on our view that the marriage was perhaps somewhat more robust than Dr Wear gave it credit for. 33. In coming to a conclusion as to the gross figure for compensation for personal injury (prior to the application of the discount), we have taken account of the Guidelines provided by the Judicial Studies Board in regard to damages for psychiatric damage. We consider that the case falls between the Moderate and Moderately Severe categories of Section A of Chapter 3 of the Guidelines. The Applicant's ability to cope with life and work has been significantly affected and continues to be so. We expect, however, that it will improve in the future. Her relationships with her family and others have been substantially injured, though again, we expect improvement. We expect treatment to be successful. We expect the Applicant to return to employment similar to that she had before July 2002. We consider the appropriate figure for compensation for personal injury to be£10,000 . 34. The award in respect of personal injuries is subject to a reduction of one-third to take account of the likelihood that the Applicant would fall ill anyway. A further deduction is appropriate to take account of the 80%/20% proportions referred to by Dr Wear in his letter of24 November 2003 . He then said "
"65. (1) Where an employment tribunal finds that a complaint presented to it under section 63 is well-founded the tribunal shall make such of the following as it considers just and equitable – (a) … (b) an order requiring the respondent to pay to the complainant compensation of an amount corresponding to any damages he could have been ordered by a county court or by a sheriff court to pay to the complainant if the complaint had fallen to be dealt with under section 66."
"35. Causation Having shown a breach of duty, it is still necessary to show that the particular breach of duty found caused the harm. It is not enough to show that occupational stress caused the harm. Where there are several different possible causes, as will often be the case with stress related illness of any kind, the claimant may have difficulty proving that the employer's fault was one of them: see Wilsher v Essex Area Health Authority[1988] AC 1074 . This will be a particular problem if, as in Garrett, the main cause was a vulnerable personality which the employer knew nothing about. However, the employee does not have to show that the breach of duty was the whole cause of his ill-health: it is enough to show that it made a material contribution: see Bonnington Castings v Wardlaw[1956] AC 613 . 36. Apportionment and quantification Many stress-related illnesses are likely to have a complex aetiology with several different causes. In principle a wrongdoer should pay only for that proportion of the harm suffered for which he by his wrongdoing is responsible: see e.g. Thompson v Smiths Ship Repairers (North Shields) Ltd[1984] QB 405 ; Holtby v Brigham & Cowan (Hull) Ltd [2000] PIQR Q293 ; Rahman v Arearose Ltd[2001] QB 351 . Thompson and Holtby concerned respectively deafness and asbestosis developed over a long period of exposure; not only were different employers involved but in Thompson some of the exposure by the same employer was tortious and some was not. Apportionment was possible because the deterioration over particular periods of time could be measured, albeit in a somewhat rough and ready fashion. 37. It is different if the harm is truly indivisible : a tortfeasor who has made a material contribution is liable for the whole, although he may be able to seek contribution from other joint or concurrent tortfeasors who have also contributed to the injury. In Rahman , Laws LJ quoted the following illuminating discussion from Prosser & Keeton on Torts , 5th ed (1984) pp 345-346: "
"It seems to me that once the claimant has shown that the defendant's breach of duty has made a material contribution to his disease, justice requires that he should be entitled to recover in full from those defendants unless they show the extent to which some other factor, whether it be 'innocent' dust or 'tortious' dust caused by others, also contributed."
"29. … The Applicant, whatever the situation in regard to her marriage might have been at the time, was happy in her work and looked forward to developing her career with the Respondents. That opportunity was, quite simply, taken away from her."