Where an administrative decision maker refers in reasons to a decision made under a parallel regulatory regime, the reference will ordinarily be characterised as a statement of fact about the existence of the decision rather than a legal conclusion as to its validity, particularly where the decision maker had no decision-making authority under the parallel regime and the validity of the other decision was not a precondition to the exercise of the decision maker's own powers. Even if such a reference contains an error of law, it will not be material where there is no realistic possibility the decision could have been different.
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