"We note that Callinan J ... has expressed the view that it would be preferable in future for challenges of apprehended bias to be determined, where possible, by a judge other than the one who has been asked to disqualify himself or herself. With respect, we are unable to agree. On that approach, for example, some other judge of the Federal Court would have considered the challenge made to Goldberg J in Ebner. Adopting such a procedure would require an examination of the power of that other judge to determine the question and the way in which the other judge's conclusion would find its expression. In particular, is the question of possible disqualification to be treated as an issue in controversy between the parties to the proceeding and is it to be resolved by some form of order? The issue is not one which was argued in the present appeals, and it is sufficient to say that, in our view, Goldberg J adopted what was both the ordinary, and correct, practice of deciding the matter himself."