The magistrate's decision was not final or conclusive of the issue
74 The most fundamental issue in relation to the applicability of the doctrines of res judicata and estoppel to the facts of this case concerns the element or requirement of finality.
75 There could be little doubt that the magistrate's decision to uphold J.P. Morgan's and ASIC's objections to the production of the unredacted WPP documents was an interlocutory decision or judgment. The principal or substantive proceedings before the magistrate were committal proceedings in respect of charges against each of the accused, including ANZ. The relevant subpoenas were issued in the context of the committal proceedings and the determination of the objection to production of the unredacted WPP documents in answer to the subpoenas was no more than an interlocutory determination in those proceedings.
76 The issuing of a subpoena to a "stranger" at the request of a party to a proceeding, and an application to set aside that subpoena, are interlocutory steps in the existing proceeding, not a separate proceeding: Brouwer v Titan Corporation Limited (1997) 73 FCR 241 at 242-243; R v Gray; Ex parte Marsh (1985) 157 CLR 351 at 362; Marsh v Adamson (1985) 9 FCR 408 at 417. A judgment in respect of the application to set aside the subpoena is accordingly an interlocutory judgment. A "stranger", in this context, refers to a person or entity who is not a party to the proceeding in respect of which the subpoena was issued: Brouwer at 243.
77 More significantly, for present purposes, it has been held that, where a subpoena has been issued to a stranger to the proceeding and that person claims that documents are immune or privileged from production, an order rejecting the claimed immunity or privilege and requiring the person to produce the documents in question is an interlocutory order: Brouwer at 243; Assistant Treasurer and Minister for Competition Policy and Consumer Affairs v Cathay Pacific Airways Ltd (2009) 179 FCR 323; [2009] FCAFC 105 at [25] (Flick J, with whom Spender and Lander JJ agreed); see also Attorney-General (NSW) v Stuart (1994) 34 NSWLR 667 at 673. Indeed, the Full Court in Brouwer stated (at 244) that "a decision in relation to a subpoena, the issue of which is a procedural step in the existing proceedings provided for by the rules of court governing them, seems to us to be a paradigm case of an interlocutory judgment": see also R v Gray at 362.
78 J.P. Morgan appeared to concede that the magistrate's decision upholding the objection to the production of the WPP documents on the basis of the application of ss 131 and 131A of the Evidence Act (NSW) was an interlocutory decision or order. It contended that the magistrate's determination was nevertheless final for the purpose of applying the doctrines of res judicata and estoppel. It relied, in that context, on the test for finality as propounded in Kuligowski at [25] - that the decision is "one which is not of an interlocutory character, but is completely effective unless and until rescinded, altered or amended". J.P. Morgan submitted that the finality or conclusive nature of the magistrate's determination was apparent from the fact that, had the magistrate not upheld the objection to production, the unredacted WPP documents would have been required to be produced. In J.P. Morgan's submission, that result would, as a practical matter, have been final insofar as J.P. Morgan and its privilege claim were concerned.
79 There would appear to be a number of difficulties with J.P. Morgan's contentions in that regard.
80 The first difficulty for J.P. Morgan is that, once it is accepted that the magistrate's order was interlocutory in nature, it would, at first blush at least, appear to be somewhat oxymoronic to contend that it was final. Indeed, the test for determining whether a judgment is final or interlocutory is whether or not the judgment finally determines the rights of the parties: Hall v Nominal Defendant (1966) 117 CLR 423 at 439 (Taylor J) and 443-444 (Windeyer J); Licul v Corney (1976) 180 CLR 213 at 225; Blair v Curran at 332. Interlocutory orders and determinations, by their very nature, are not final in character: Windsor v Sydney Medical Service Co-operative Ltd (No 2) [2009] FCA 704 at [25]. It has been held that they are therefore "insufficient to create an issue estoppel": Windsor at [25]; Wilson v Union Insurance Co (1992) 112 FLR 166 at 181. As McClelland J put it in Brimaud v Honeysett Instant Print Pty Limited (1988) 217 ALR 44 at 46, "[i]nterlocutory orders, of their very nature, create no res judicata or estoppel, and the court retains jurisdiction to set aside, vary or discharge an interlocutory order up to the time of the final disposition of the proceedings".
81 Nothing said in Ainslie, Somodaj or Kuligowski suggests that an interlocutory order can somehow be considered to be final for the purposes of the application of the principles of res judicata or estoppel. Indeed, the test for a "final decision" in Somodaj and Kuligowski would appear to expressly exclude decisions of an "interlocutory character". There is nothing to suggest that the decisions in question in Ainslie, Somodaj and Kuligowski were interlocutory decisions. The reason that the relevant decision in Ainslie, relating to the ongoing payment of an adjustable weekly sum (at 389), was considered not to be final was because it was not completely effective; something more needed to be done before it could be enforced or was enforceable. The issue in both Somodaj and Kuligowski was that, while the decisions in question were completely effective and finally determined the rights of the parties, the relevant legislation provided that the decision-maker could subsequently rescind, alter or amend the decision. It was held, in both cases, that the mere fact that the legislation provided that the otherwise effective, final and enforceable decisions could subsequently be rescinded, altered or amended did not mean that they were not final in nature for the purposes of estoppel or res judicata.
82 The second difficulty is that, at least for the purposes of determining whether an appeal from the judgment is as of right, or only by leave, the question whether a judgment finally determines the rights of the parties must generally be determined having regard to the "legal rather than the practical effect of the judgment": Carr v Finance Co of Australia Ltd (1981) 147 CLR 246 at 248; Plaintiff S164/2018 v Minister for Home Affairs (2018) 361 ALR 8; [2018] HCA 51 at [11]; Computer Edge Pty Ltd v Apple Computer Inc. (1984) 54 ALR 767 at 768. The question is whether the judgment "finally determines, in a legal sense, all the rights of the parties that are in issue in the proceedings": Brouwer at 242. J.P. Morgan's reliance on the practical effect of the magistrate's decision, had the decision been adverse to it, would appear to be misplaced.
83 There is, however, a line of authority (not adverted to by any of the parties) which would suggest that the cases which consider the question of the finality of a judgment for the purposes of determining appeal rights may not apply, or may be of limited assistance, when it comes to addressing the element of finality for the purposes of determining whether the judgment may give rise to an issue estoppel. Indeed, that line of authority tends to indicate that, in determining whether a judgment is final for the purpose of determining whether it may give rise to an issue estoppel, the fact that the judgment is interlocutory may be relevant, but it is not determinative, and the real question is whether the judgment can properly or reasonably be regarded as a final determination of the issue between the parties: Carl Zeiss at 910; Joseph Lynch Land Co Ltd v Lynch [1995] 1 NZLR 37 at 43; Makhoul v Barnes (1995) 60 FCR 572 at 582-583; Santos v Delphi Petroleum Pty Ltd [2002] SASC 272 at [390]-[400]; Inasmuch Community Inc v Bright [2006] NSWCA 99 at [60]; Castillon v P & O Ports Limited (No. 2) [2008] 2 Qd R 219; [2007] QCA 364 at [52]-[58].
84 The issue is not entirely easy to resolve. There appears to be an element of circularity in respect of the issue and the test which has been proposed in the authorities is somewhat elusive and question-begging. Be that as it may, even accepting that in some circumstances an interlocutory decision may nonetheless be considered to be final for the purposes of determining whether it may give rise to an issue estoppel, and even accepting that the relevant test is whether the judgment can properly or reasonably be regarded as a final determination of the issue between the parties, I am not persuaded that the magistrate's decision in this matter could properly or reasonably be regarded as a final determination of the question whether the unredacted WPP documents are privileged from production. That is so for a number of reasons.
85 First, I do not consider that it is appropriate to consider the question of finality from the perspective of the practical effect of the decision had it been determined adversely to J.P. Morgan and the objection to production dismissed. Rather, the question must be approached from the perspective of what was actually decided, which was that ss 131 and 131A of the Evidence Act (NSW) applied to the documents and the objection to production by J.P. Morgan and ASIC was upheld.
86 Second, as just noted, the magistrate's decision was unquestionably based on the application of s 131 of the Evidence Act (NSW). It follows that, at the very most, the decision may have finally determined the issue, as between ANZ, on the one hand, and the ACCC, ASIC and J.P. Morgan on the other, concerning the application of s 131 of the Evidence Act (NSW) to the documents in question in the specific context of the objection to production of those documents pursuant to the subpoena issued by the Local Court of New South Wales at the request of ANZ. It cannot be accepted that the decision finally or conclusively determined any broader issue as between the parties. In particular, it cannot be accepted that the decision finally and conclusively determined that J.P. Morgan and ASIC can resist production of the unredacted WPP documents on the basis that they are privileged, even if the requirement to produce arises in the context of a different subpoena, in a different court and in circumstances where s 131 of the Evidence Act (NSW) does not apply. That is not what the magistrate decided.
87 Third, it is not even entirely clear that the magistrate's decision finally and conclusively determined the issue between the parties in respect of the production of the documents in the Local Court. As the decision was unquestionably an interlocutory decision, it would have been open to ANZ to apply to have the magistrate revisit, set aside or vary the decision. Any such application would be unlikely to be successful if the facts and circumstances had not changed. If they had, however, it would have been open to the magistrate to set aside her earlier decision and overrule the objection to production. For example, if the circumstances changed such that one of the exceptions in s 131(2) was engaged, it would have been open to ANZ to call on the subpoena again, or call on a new subpoena in the same terms, and argue that the documents were no longer protected from production by ss 131 or 131A of the Evidence Act (NSW).
88 In all the circumstances, the relevant decision by the magistrate could not be said to have finally determined, in any relevant sense, all of the rights of the parties that were in issue in the committal proceedings. At most, it determined, on an interlocutory basis, that ASIC and J.P. Morgan, who were not parties to the committal proceedings, had the right to object to the production of the unredacted WPP documents pursuant to the subpoena issued at the request of one of the parties to the proceedings, ANZ, on the basis of the application of s 131 of the Evidence Act (NSW). The decision could not be said to have determined, let alone finally and conclusively determined, that the unredacted parts of the documents were privileged from production in any other circumstances, including in a different court, pursuant to a different subpoena and in circumstances where s 131 of the Evidence Act (NSW) did not apply.
89 The doctrines of res judicata and estoppel accordingly cannot apply to the decision of the magistrate so as to preclude or prevent ANZ from calling on the subpoena issued by this Court which seeks production of the unredacted WPP documents.