Under the Migration Act s 476 review scheme, want of logic or irrationality in Tribunal reasoning does not constitute a reviewable error of law, following Epeabaka. The exclusion in s 476(2)(b) is not confined to Wednesbury unreasonableness of discretionary powers but extends to decisions involving the formation of an opinion on jurisdictional facts. Actual bias requires proof that the decision-maker pre-judged the case and was unable or unwilling to decide impartially; a pattern of erroneous reasoning, even serious errors, does not without more establish actual bias.
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