"The relevant test has been prescribed by this Court in a number of cases and is expressed in Livesey v. New South Wales Bar Association [1983] HCA 17; (1983) 151 CLR 288 at pp.293-294 in these terms: '[The] principle is that a judge should not sit to hear a case if in all the circumstances the parties or the public might entertain a reasonable apprehension that he might not bring an impartial and unprejudiced mind to the resolution of the question involved in it ... Although statements of the principle commonly speak of 'suspicion of bias', we prefer to avoid the use of that phrase because it sometimes conveys unintended nuances of meaning.' In applying this test, it is necessary to bear in mind the caution expressed by Mason J. in Re J.R.L.; Ex parte C.J.L. [1986] HCA 39; (1986) 161 CLR 342 at p.352: 'It seems that the acceptance by this Court of the test of reasonable apprehension of bias in such cases as Watson [1976] HCA 39; (1976) 136 CLR 248 and Livesey has led to an increase in the frequency of applications by litigants that judicial officers should disqualify themselves from sitting in particular cases on account of their participation in other proceedings involving one of the litigants or on account of conduct during the litigation. It needs to be said loudly and clearly that the ground of disqualification is a reasonable apprehension that the judicial officer will not decide the case impartially or without prejudice, rather than that he will decide the case adversely to one party. There may be many situations in which previous decisions of a judicial officer on issues of fact and law may generate an expectation that he is likely to decide issues in a particular case adversely to one of the parties. But this does not mean either that he will approach the issues in that case otherwise than with an impartial and unprejudiced mind in the sense in which that expression is used in the authorities or that his previous decisions provide an acceptable basis for inferring that there is a reasonable apprehension that he will approach the issues in this way.' In Reg. v. Australian Stevedoring Industry Board; Ex parte Melbourne Stevedoring Co. Pty. Ltd. [1953] HCA 22; (1953) 88 CLR 100 at p.116, Dixon CJ, Williams, Webb and Fullagar JJ. said: 'when bias of this kind is in question, as distinguished from a bias through interest, before it amounts to a disqualification it is necessary that there should be strong grounds for supposing that the judicial or quasi-judicial officer has so acted that he cannot be expected fairly to discharge his duties. Bias must be 'real'. The officer must so have conducted himself that a high probability arises of a bias inconsistent with the fair performance of his duties, with the result that a substantial distrust of the result must exist in the minds of reasonable persons. It has been said that 'preconceived opinions - though it is unfortunate that a judge should have any - do not constitute such a bias, nor even the expression of such opinions, for it does not follow that the evidence will be disregarded', per Charles J., Reg. v. London County Council; Re The Empire Theatre (1894) 71 LT 638 at p.639'."