ii. this means that the so-called Anshun principle disentitles the relevant defendants from now seeking to litigate the Contracts Review Act claims.
Dealing with the issue
23 There is no basis for the Court doing otherwise than permitting the application for leave to amend. The short position is that the party seeking to raise the so-called 'Anshun estoppel' may plead that very matter, hence leaving the issue for an informed decision in the usual way.
24 Mr Smith, appearing for the CU defendants, contended that there was no room for the application of any Anshun estoppel because such an estoppel does not run where a Contracts Review Act claim is sought to be raised as a defence: that is to say that this form of estoppel cannot apply to a defence.
25 I do not see that this is an occasion for a close analysis of the reach of the Anshun form of estoppel. This can be treated for determination on proper pleadings.
26 However the position being presently at an interlocutory stage and having been raised in an attempt to pre-empt the matter being litigated, the matter does call for some attention.
27 The so-called Anshun argument likely has considerable problems and this for the reason that the formulation of the separate question orders for the test case does not appear to have, at least expressly, closed out the possibility of other questions requiring determination.
28 Other likely problems for those who oppose the grant of leave to amend include the tenuous alleged connection between, on the one hand, comments by the Chief Justice and, on the other hand, the very different parameters raised in litigation concerning the Contracts Review Act.
29 It is appropriate to observe that in National Mutual Life Nominees Ltd v Leisuremark Australia Pty Ltd (Supreme Court of New South Wales, Einstein J, 30 November 1998, unreported) an examination was conducted of various parameters concerning when this form of estoppel may or may not apply. The Court considered the following extract from Port of Melbourne Authority v Anshun Pty Ltd (1981) 147 CLR 589, noting [at 16] that an Anshun estoppel would operate if: