The second period
44 The second period covers that time when the respondent did not work at all. Assisted by the rehabilitation health professionals, he returned to work in stages, but it does not appear to be the subject of dispute that he did not work at all from the time of the stress attack on 20 September 2000 until he entered into a retainer with the property development company on 21 January 2002. That was a period of 16 months.
45 The trial judge allowed an amount of $250 in respect of the respondent's loss of earning capacity for a period of 173 weeks commencing from 1 July 2000 until 29 October 2003 (the latter date being the commencement of the trial). In other words, his Honour did not take into his calculation the period of 16 months when the respondent did not work at all. The basis for ignoring the second period appears in the following passage from his judgment:
"True it is he was off work for some time through stress related matters, but I'm satisfied that the evidence shows that he has suffered significant physical impairment as a result of this accident."
46 The issue, then, is whether or not some adjustment should have been made by the trial judge by reason of the fact that the respondent did not work at all for a period of 16 months by reason of a supervening event, that is, by reason of the stress attack, unrelated, as his Honour found, to the accident. The trial judge seems to have been aware of the appellant's stance on this issue because, when ruling on the admissibility of reports of the rehabilitation health professionals, the trial judge noted as follows:
"The defence case is that any loss of earnings in this matter relate to another incident, or events leading up to another incident in September 2000, and any loss of earnings may be unrelated to the frank episode in this matter, being the injury sustained at K-Mart on 3 June '99."
47 It was submitted by the respondent's counsel on this appeal that the trial judge had in fact made an appropriate adjustment to take account of the supervening occurrence of the stress attack. That is to be seen, it was said, from the fact that the loss of earnings referrable to the first period, being an amount of $14,9196.78, amounts to $286.86 per week, yet the trial judge reduced the weekly amount to $250. It was said that the difference of about $36 was intended to be the appropriate adjustment.
48 The difficulty with this submission is that nowhere in his Honour's judgment does he refer to any such adjustment. It seems as though he simply selected the amount of $250 per week as reasonable in the calculation of past economic loss.
49 In my opinion, the trial judge erred in law in the approach that he took. It was held by the House of Lords in Jobling v Associated Dairies Ltd (1982) AC 794 that the court should not disregard supervening factors in arriving at just and sufficient but not excessive compensation. That was a case where the plaintiff had suffered an accident in the course of his employment. By reason of his employers' negligence, he sustained a back injury that reduced his earning capacity by 50 per cent. He later developed a condition, unrelated to the earlier injury, that rendered him totally unfit for work. The issue was whether the liability of the employers was limited to loss of earnings up to the time when the later condition resulted in total incapacity or whether the employers were liable to pay damages for loss of earnings for the period which, in the absence of the later condition, would have represented the balance of the plaintiff's working life. It was held that the later condition had to be taken into account which had the effect of rendering the employers liable for damages only up to the emergence of the later condition. Lord Bridge of Harwich put the principle in the following terms at p 820:
"But when the supervening illness or injury which is the independent cause of loss of earning capacity has manifested itself before trial, the event has demonstrated that, even if the plaintiff had never sustained the tortious injury, his earning would now be reduced or extinguished."
50 Their Lordships were at pains to distinguish or at least question the earlier House of Lords decision of Baker v Willoughby (1970) AC 467. That was a case where the plaintiff had sustained a leg injury due to the driver's negligence in a motor vehicle accident. Before his trial for damages due to that injury, he was shot in the same leg during a robbery and that necessitated the amputation of the leg. At the trial, he was awarded damages for the continued disability in his left leg, despite the fact that the disability from the first injury had been obliterated by the amputation. At least one of the bases for their Lordships in Jobling v Associated Dairies departing from the earlier decision was the different facts. The earlier decision concerned a supervening injury as a consequence of a later tortious act; in Jobling v Associated Dairies, the supervening condition was a natural event and not the consequence of a tortious act.
51 In the present case, the facts are more analogous to those in Jobling v Associated Dairies than in Baker v Willoughby in that the respondent's stress attack was a supervening natural occurrence and not the consequence of any subsequent tortious act. To that extent at least, the decision in Baker v Willoughby may be put aside for present purposes. So much appears from the judgment of Lord Edmund-Davies in Jobling v Associated Dairies at p 809, where he said: