We do not intend to refer at length to the numerous matters raised by Mr Austin in support of his application for leave. It is sufficient to observe that almost all of the matters appealed against are findings of fact which, in our view, were reasonably open to the trial judge. Not only that; the findings of fact pertaining to the heart of the dispute resulted from Staff J's conclusion that he should not rely on Mr Austin's evidence where it conflicted with the evidence of the witnesses called by the respondents, each of whom his Honour found to be reliable. Findings of this nature were described by Kirby J in State Rail Authority of New South Wales v Earthline Constructions (In Liq) (1999) 160 ALR 588 at [92] as the very limited class of cases where trial judges enjoy true advantages over appellate courts: those cases where the decision depends upon "resolving a clash of critical oral testimony, oath against oath". There is nothing in this case to suggest that Staff J's findings, based on assessments of the credibility of witnesses, manifest "clear, compelling, palpable or plain errors" sufficient to warrant an exception to the rule of appellate restraint in this class of cases (see Whisprun Pty Ltd (formerly Northwest Exports Pty Ltd) v Dixon (2003) 200 ALR 447 at [94] and [97] - [98] per Kirby J).
9 We have made specific reference to the relevance of factual findings on the question of leave because it is apparent to us that what the appellant essentially seeks to challenge in these proceedings are findings of fact made at first instance. The grounds of appeal set out in the amended application assert, for example, that the appellant's services were charged at a qualified technician's call out rate and that the appellant used his own motor vehicle and paid all related costs which therefore entitled him to be reimbursed. The grounds further assert that at all times while in the employ of the first respondent, he performed the duties of a grade 5 electrical worker. The Chief Industrial Magistrate's decision, however, dealt extensively with each factual matter relied upon by the appellant in the amended application. It appears to us, from the reasons given in the decision, that it was reasonably open, on the evidence, for his Honour to make the findings he did.
10 His Honour also made some findings based on a preference for the testimony of a director of the appellant's employer during the relevant period, Mr MacIlveen. For example, in relation to the appellant's claim at first instance for a tool allowance, the appellant had contended that he did not receive one and purchased his own tools. Mr MacIlveen had given evidence that only a small quantity of tools were required for the work performed by the appellant and these were all provided by the employer. His Honour concluded on the basis of this evidence that it was therefore not relevant that the appellant purchased tools beyond what were required for work. In coming to this conclusion, his Honour also placed reliance on the applicable Award. Clause 5 of that Award states that a tool allowance is to be paid for "tools not automatically provided by the employer but which are ordinarily required by the tradesperson or apprentice for the performance of their duties."
11 We see no error in this conclusion. It would seem that, on the evidence before his Honour, such a conclusion was reasonably open. The circumstances in which a finding of fact, at first instance, based on the credibility of witnesses may be set aside upon appeal were examined by the High Court in Fox v Percy (2003) 214 CLR 118 where it was said (at [28]) by the majority (Gleeson CJ, Gummow and Kirby JJ):