Judgment date: 9 December 2010
Giles JA:
"87 Aronson sums it up in “Government Liability in Negligence” [2008] 32 MULR 44 at 80 that “[o]nly the grossest unreasonableness will invalidate the exercise of a statutory discretion”. The learned author suggests that instead of transplanting Wednesbury unreasonableness “[i]t might have been more straightforward to draft the new standard simply as ‘gross negligence’”. I say nothing of that; in seeking to give content to the language of s 43A, however, a constant is that Wednesbury unreasonableness must be at a high level. The force of s 43A, in its use of language modelled on that of Wednesbury unreasonableness, lies in “could properly consider”, with the restraint of “could” moderated by “properly”. Necessarily, questions of degree and judgment arise in both reasonableness and properness.
88 It would be preferable to avoid substituting for the language of s 43A the shorthand of whether the authority’s conduct was “irrational”, as the trial judge did (referring to Mr McGregor’s decision rather than the RTA’s conduct) at [121]. That his Honour made the substitution is understandable, since the Minister did so in the second reading speech in relation to s 43 of the CL Act (Second Reading Speech, Legislative Assembly, 23 October 2002, 5767 (Mr Carr)). Lord Diplock had much earlier equated irrationality with Wednesbury unreasonableness (Council of Civil Service Unions v Minister for the Civil Service at 410), and Minister for Immigration and Citizenship v SZMDS [2010] HCA 16; (2010) 240 CLR 611 is a recent consideration of the place of irrationality or illogicality in judicial review. In Stovin v Wise (1996) AC 923 at 952-3 Lord Hoffman spoke of irrationality in connection with a road authority’s negligence.