"The test for apparent bias now settled by a line of recent decisions of this court and the House of Lords is that, having ascertained all the circumstances bearing on the suggestion that the judge was (or would be) biased, the court must ask 'whether those circumstances would lead a fair minded and informed observer to conclude that there was a real possibility ... that the tribunal was biased'."
"As already indicated, however, I do not think that disqualification of a judge for apparent bias is a discretionary matter. There was either a real possibility of bias, in which case the judge was disqualified by the principle of judicial impartiality, or there was not, in which case there was no valid objection to trial by him. On the issue of disqualification an appellate court is well able to assume the vantage point of a fair-minded and informed observer with knowledge of the relevant circumstances. It must itself make an assessment of all the relevant circumstances and then decide whether there is a real possibility of bias."