9 The trial judge concluded that "he was a hard worker" (red 41 M).
10 The second group of findings or of evidence favourably referred to was to the effect that even before the 18 April 1995 injury and the further injury on 7 August 1996, the plaintiff's back was in a damaged state in that there were "degenerative changes and congenital weakness disclosed in the x-rays of the plaintiff's back" (red 44 D-E). The trial judge said at red 44 F-P:
"Although there was ample evidence from the medical experts that the incidents in both 1995 and 1996 could, in some circumstances, have had a traumatic effect on a person without any congenital weakness, nonetheless, the overall medical opinion clearly supported the view that some account should be taken of the fact that the plaintiff did have a back which was, for reasons quite independent of either of these events, likely to precipitate some such condition as that from which he now suffers.
There is also in support of that, the incident, albeit of no long-term effect, while working with Steggles in the early 1990s, which was at least a warning signal, if nothing else, that the plaintiff had a condition in his back which was likely to respond adversely to undue stress.
There is in this regard the opinion of Dr Burgess...that one-third of his ongoing condition, even if the later events were accepted as the precipitating cause(s) should be attributed to his congenital condition."
11 There is one other area of evidence referred to by the trial judge to the following effect (red 37 R to 38 H):
"[At about 2 September 1996] that is after the results of the x-ray and CT scan were known, a meeting took place between the plaintiff, Mr Fleigner, his supervisor, and Mr Alan Barlow, the Council's maintenance foreman. According to the evidence of Messrs Fleigner and Barlow, the plaintiff had been, to use Mr Fleigner's word "ecstatic" about the job offer. [That was an offer of permanent employment.] But he went on to tell them of a CT scan and went on to say that he had had back problems for years and used the words which both of the witnesses quoted, `You have backed the wrong horse.
He suggested that his back problems were hereditary and told the two men that the Council would not have to worry about having to bear any blame for his back condition. He went on to say, according to Mr Fleigner, that although he had back pain from time to time as a result of the condition, he took care while he was working and knew how to avoid any serious injury."
12 The trial judge's conclusion was set out at red 46 L-Q as being that there was a:
"likelihood that the congenital condition of his back would have brought about at least some degree of pain and discomfort over time, not necessarily identical with what he now suffers, but sufficient to be taken into account as mitigating the percentage which might otherwise have been appropriate."
13 This led the trial judge to select 24 per cent of a most extreme case as the appropriate figure after "taking all of those matters into account".
14 It is not easy to reach a conclusion as to the extent of the plaintiff's symptoms before 18 April 1995. However, the selection of an appropriate percentage in relation to a most serious case entails a judgment resting on matters of fact and degree and on matters of opinion, impression and estimation on which minds can reasonably differ. The plaintiff, but for reliance on Purkess v Crittenden, does not point to any factor which the trial judge ought to have considered but did not, nor to any relevant factor which he failed to consider, nor to any error of fact or misdirection in law. Nor can it be said that the result is so extreme as to point to a miscarriage of the judicial process.
15 It was submitted that any reading of the judgment and the transcript would cause a reader to conclude that the figure of 24 per cent was plainly wrong. I disagree.
16 The plaintiff gave evidence-in-chief that after the accident he had been able to do fencing, mustering and tractor work two to three days a week that left him "on and off sore" (combined appeal book p 22 Y). He had "niggling discomfort" two to three times a week if he engaged in constant bending, constant sitting or constant standing (combined appeal book 23 W). He was not taking regular medication but he took Voltaren when his back got bad, once or twice a month (combined appeal book 26 B-C).
17 In cross-examination he said he was having less frequent bouts of pain and taking medication less frequently (combined appeal book 26 S-V). Admittedly this would appear in part to have been because in the 18 months before the trial he had done less work than in the period when he was engaged by the defendant full-time (combined appeal book 50 S-V).
18 The notice of appeal, though not the written submissions, referred in relation to this ground of appeal to Purkess v Crittenden. The issues connected to that case will be discussed in relation to ground 3. Subject to that discussion, in the circumstances no appealable error has been shown in relation to ground 1.
19 Ground 2 was as follows:
"The amount of damages for future economic loss was manifestly inadequate having regard to the claimant's age, background and employment prospects, in circumstances where there was no evidence available to his Honour to satisfy the requirements of Purkess v Crittenden (1965) 114 CLR 164."
20 Paragraph 7 of the plaintiff's written submissions put the argument in the following way:
"His Honour found the plaintiff had suffered a reduction in earning capacity of $150 per week. It is submitted that finding was against the weight of the medical evidence which suggested the plaintiff was unfit for labouring work, despite the fact he had continued to perform that work on a part-time basis following the accident and up to the time of trial. It is submitted that the plaintiff's loss of earning capacity should have been assessed in the order of $300 per week."
21 The trial judge found at red book 45 B-P the following:
"There is no real dispute...that, putting aside for one moment the question of the contributing causes, the plaintiff now suffers from a degree of permanent disability. It is a disability which has a disproportionate effect on the plaintiff's earning capacity in view of the kind of work which he has been familiar with and successful in undertaking, namely farm labouring and other types of labouring work such as that which he was doing for the defendant Council at the time of the Council's negligence.
The permanent character of the disability and in particular its effect on his earning capacity is not only supported by the medical evidence, but perhaps most pointedly by the Council's own decision to refuse permanent employment when his back condition was revealed to the Council in the questionnaire completed by Dr Wallington. That would seem to certainly deny the Council any opportunity to suggest that there was no permanent disability affecting his capacity to earn."
22 At red book 47 R to 48 I the trial judge said:
"It is appropriate in my view, to take into account the level of income which the plaintiff enjoyed at the time of the incident giving rise to this claim, and indeed to the very real prospect that he was at the point of full-time employment at a similar level of income, if not something slightly better, and, in view of the uncontroverted evidence, the fact that he will be very unlikely to secure employment of a similar kind in future because of his ongoing problems with his lower back, notwithstanding his own continued assertions, at least on some occasions, that he is quite well enough to undertake full-time employment of the same kind.
The differential in those circumstances, were it not complicated by the effect of his congenital condition, would be some $150 per week between what he might have been able to earn as a full-time labourer able to undertake the full range of heavy tasks, and the somewhat more limited choices which are now available to him as an unskilled labourer unable to undertake that same full range of activities."