The "non-repairable damage" issue
18The appellant alleged that the vehicle had sustained "non-repairable damage" as part of its argument that the vehicle could not lawfully be repaired because it was a "written-off vehicle" (s 16D(1)). Whether the vehicle sustained such damage is partly a question of fact and the appellant bore the onus of establishing the relevant fact. What is the relevant fact depends upon the proper construction of reg 83C(1)(c).
19That regulation requires that "the vehicle has been damaged by 3 or more of the following indicators of impact damage". In that expression, "by" is used in the sense 'to the extent of'. In other words, the damage which the vehicle sustained must consist of three or more of the "indicators of impact damage". In the latter expression, the "indicators" are of impact damage to five distinct parts of the vehicle. In the case of three of those parts, the damage must be to an area equal to or exceeding 300mm by 300mm. In each case, for that damage to be an "indicator of impact damage", it must have resulted from impact involving the vehicle. Damage consisting of bending, cracking, breaking, deformation or denting to, or of, any of the five described parts of the vehicle which resulted from a collision with another vehicle or object would be "impact damage" satisfying the required description, provided that in the case of damage to the roof, cabin floor pan or firewall it was to an area of at least 300mm by 300mm.
20The relevant fact in issue was whether there had been any such damage to the cabin floor pan, firewall or suspension of the vehicle. The existence of such damage could be established by evidence of what had been observed on inspection. It could also be established by measurements taken of the relevant parts from which opinions could be expressed as to the existence of deformation which may not be readily observable; or perhaps by way of testing of materials from which opinions could be expressed as to the presence of internal cracking or other damage, again not readily observable. The fact that any such damage had resulted from an impact might also be capable of being proved by opinion evidence based on the nature and extent of the damage.
21Mr Thomas and Mr Movizio gave evidence directed to this issue. That evidence was in part evidence of fact and in part opinion evidence. The primary judge accepted the evidence of Mr Movizio in preference to that of Mr Thomas. To the extent that he gave reasons for doing so, they are to be found in [32] which is set out in [11] above.
22The appellant argues that that conclusion and those "reasons" involve a number of errors. First, it is said that the primary judge did not give any or any sufficient reasons for preferring Mr Movizio's evidence to that of Mr Thomas. Secondly, it is said that if he preferred Mr Movizio's evidence because of Mr Thomas' reliance on flawed measurements made by Mr Lajkoski, he erred because Mr Thomas relied upon his own measurements. The appellant also says that Mr Lajkoski's measurements were reliable because, as he pointed out in re-examination, the measuring machine would not have calibrated properly unless he used the correct specifications. Finally, it is said that in relying on Mr Movizio's evidence, the primary judge erred because his evidence was based on measurements made by Mr Xabergas which adopted a measuring method which was inherently unreliable.
23The first of these arguments must be accepted. The second and third will therefore be addressed and taken into account when considering whether the evidence established that the vehicle had sustained "non-repairable damage".
24The principles concerning the obligation of a court to give adequate reasons in the context of the resolution of issues involving differences between expert witnesses are discussed in the judgement of Ipp JA in Wiki v Atlantis Relocations (NSW) Pty Ltd [2004] NSWCA 174; (2004) 60 NSWLR 127 at [56]-[68]. In that case the trial judge had preferred the expert testimony of one medical specialist over that of others for reason of his "eminence" and the manner in which he gave evidence. In that context, Ipp JA said:
"[61] But, where the issue in dispute involves differences between expert witnesses that are capable of being resolved rationally by examination and analysis, and where the experts are properly qualified and none has been found to be dishonest, or misleading, or unduly partisan, or otherwise unreliable, a decision based solely on demeanour will not provide the losing party with a satisfactory explanation for his or her lack of success. A justifiable grievance as to the way in which justice was administered will then arise."
As Sheller JA explained in Archibald v Byron Shire Council [2003] NSWCA 292; (2003) 129 LGERA 311 at 323 [54]:
"Where a dispute, such as this one, involves something in the nature of an intellectual exchange with reasons and analysis advanced on either side, the parties are entitled to have the judge enter into the issues canvassed before the court and to an explanation by the judge as to why the judge prefers one case over the other. This is particularly so where there is disputed expert evidence."
25Unlike the position in Wiki v Atlantis Relocations (NSW) Pty Ltd, the primary judge did not express his preference for the evidence of Mr Movizio to that of Mr Thomas by reference to any assessment of either witness's demeanour. He found that Mr Movizio provided "honest and thorough answers" and that Mr Thomas was a "careful and truthful" witness. Each was giving opinion evidence. That evidence should be based on the witness's specialised knowledge and should explain how that field of specialised knowledge, as applied to the facts assumed or observed, produces the opinion tendered: Dasreef Pty Ltd v Hawchar [2011] HCA 21; (2011) 243 CLR 588 at [35], [39], [91], [92]. If it does and there are competing opinions the Court must choose between them by reference to the proved facts, the specialised knowledge of the witness and the reasoning process which produces the opinion tendered. Having done so it must give an explanation for preferring one opinion over the other. The primary judge did not provide any explanation as to why he preferred the evidence of Mr Movizio to that of Mr Thomas. His observation as to there being reasons for the differences between their respective opinions and the identification of two possible reasons for those differences does not provide an explanation. (The possible reasons given were that Mr Lajkoski adopted incorrect manufacturer specifications and that the witnesses had different views as to what constituted "damage" for the purposes of reg 83B). The primary judge was required to say what the reasons for the differences in the opinion were and why he preferred the opinion of one to that of the other. The primary judge's reasons do no more than express a preference for the evidence of one witness over that of the other.
26Accordingly, grounds 2 and 5 of appeal are made out and this Court must undertake the process of analysing the competing evidence so as to address whether that evidence established that the vehicle had sustained "non-repairable damage". As will become apparent, it is not possible to do that on broad bases such as that Mr Movizio relied on unreliable measurements made by Mr Xabergas or that Mr Thomas' evidence is reliable because he acted upon his own measurements and not on measurements made by Mr Lajkoski or that to the extent that Mr Thomas used Mr Lajkoski's measurements, they were reliable. Instead, it is necessary to consider separately the evidence with respect to each of the three parts of the vehicle which the appellant contends was the subject of impact damage.