Where a tribunal member has expressed adverse views about a party's credibility in a prior proceeding, a fair-minded lay observer would reasonably apprehend that the member might not bring an impartial mind to a subsequent hearing involving that party, even if the subject matter of the two proceedings is different. A party who continues with a hearing after an unsuccessful disqualification application does not thereby waive the bias objection. A tribunal's refusal to disqualify for apprehended bias is not a 'decision on a question of law' for the purposes of a statutory appeal, but the resulting denial of procedural fairness founds prerogative relief.
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