CONSIDERATION
28 The first basis relied upon by the applicants in support of their application to restrain Mr Williams was the risk of misuse of confidential information. As Nettle J said in Sent v John Fairfax Publication Pty Ltd [2002] VSC 429:
[t]he court will restrain a legal practitioner continuing to act for a party to litigation if a reasonable person informed of the facts might reasonably anticipate a danger of misuse of confidential information of a former client and that there is a real and sensible possibility that the interest of the practitioner in advancing the case in the litigation might conflict with practitioner's duty to keep the information confidential, and to refrain from using that information to the detriment of the former client.
29 The parties agreed that answering the following sequence of short-form questions was a convenient way to address the issues in dispute, at least for the purposes of this application:
(1) What is the relevant information?
(2) Is that information confidential?
(3) Does the legal practitioner have possession of that information?
(4) Is the legal practitioner proposing to act "against" the former client in the requisite sense?
(5) Is there a real risk that the confidential information will be relevant?
(6) Is there no real risk of misuse of the confidential information?
30 It can be accepted, and counsel for the respondents did not dispute, that the relevant confidential information received by Mr Williams from Mr Mawhinney was that information deposed to by Mr Roberts.
31 It can also be accepted, and again it was not disputed by the respondents, that such information is confidential.
32 As a general rule, communications between a client and his or her legal representative, for the purposes of giving or obtaining legal advice, have the necessary ingredient of confidentiality, subject to exceptions not relevant here.
33 I am satisfied that each category of information identified by the applicants retains the requisite character of confidentiality in the circumstances of this case.
34 I am also satisfied, and again the respondents did not dispute, that Mr Williams is in possession of that confidential information, and that he is proposing to act "against" the applicants at the hearing tomorrow.
35 I interpolate at this point that I accept the submission made on behalf of the applicants that to the extent that Mr Williams was unable to recall, but did not deny, a number of the matters deposed to by Mr Roberts, that I should accept Mr Roberts' evidence about such matters.
36 In my view, however, the application to restrain Mr Williams from representing the respondents at the hearing failed because the answer to the fifth and sixth questions set out above at [29] is "no", in each case.
37 As to question five, as Anderson J said in Re Timbercorp Finance Pty Ltd (in liq) (2019) 137 ACSR 189; [2019] FCA 957 at [102]:
For a legal practitioner to be restrained from acting against a former client on the basis of a possible misuse of confidential information, the "possible misuse" must be sufficiently characterised. There must be a sufficient nexus between the confidential information of the former client and the manner in which it is to be misused by the legal practitioner.
38 The description of the confidential information relied on in this case is of a general nature. Mr Roberts did not descend into detail in describing the business model employed by Mr Mawhinney or the specifics about his priorities in respect of the mediation, his vulnerabilities or his appetite for risk, the precise nature of his concerns about his reputation, his access to financing, Mr Mawhinney's views about this proceeding and so on. There may be any number of reasons why Mr Roberts did not do so. As Gillard J said in Yunghanns v Elfic Ltd (unreported, Sup Ct, Vic, 3 July 1998): "the degree of particularity of the confidential information must depend upon all the circumstances. Often, it cannot be identified for fear of disclosure."
39 Counsel for the respondents did not cavil with that proposition, but submitted that it was of some significance that Mr Roberts did not say in terms that he was concerned to provide less precision of description, lest he eviscerate the very confidentiality sought to be protected. In my view, however, it is sufficiently obvious that any more detailed description than that which was provided might do that very thing.
40 In any event, however, even on the assumption that each of the items of confidential information identified and relied upon by the applicants was in fact more fulsomely discussed during the course of the mediation, in my view there could be no nexus between such matters and the task confronting the Judicial Registrar at the hearing. His task at that hearing is to do no more or no less than that which order 4 of the orders made by McElwaine J on 4 November 2022 provided, namely to conduct an "inquiry and report in accordance with the Federal Court Rules 2011 (Cth) the assessment of the security on a party and party basis …"
41 At that hearing, the Judicial Registrar will have the benefit of affidavit evidence about costs sworn by solicitors representing the respondents, an expert costs report prepared by a costs expert on behalf of the applicants, the submissions referred to above prepared by Mr Williams, and oral submissions.
42 The inquiry will be akin to the conducting of a hearing in relation to an application for security for costs. It will involve the Judicial Registrar going through the line items of the various steps to be taken in the proceeding, and forming a view in his capacity as a referee about a number of questions, including what amount would represent an appropriate party-party figure in respect of each line item. In that regard, I was told by Mr Maiden that the respondents will rely on two affidavits. The first, affirmed by Mr David McIntosh, a solicitor in the employ of Dentons, the solicitors for the respondents, deposes to the issues in the proceeding and an estimate of the respondents' costs of defending it. The affidavit contains a schedule with a long list of individual line items in the ordinary way. The second affidavit, sworn by Mr Cameron Steele, also a solicitor in the employ of Dentons, deposes to certain GST implications involved in the litigation. The respondents will rely on an expert costs report by Ms Catherine Dealehr, which is an annexure to her affidavit sworn 6 March 2023. (It is fair to say there is considerable divergence in the outcomes contended for on behalf of the parties).
43 In my view, as counsel for the respondents submitted, it is difficult to imagine how Mr Williams could consciously or subconsciously invoke any confidential information of the type described above for the purposes of conducting such an exercise before the Judicial Registrar in his capacity as a referee.
44 Counsel for the applicants submitted that the written submissions signed by Mr Williams "make insinuations to the effect that the security to be ordered is at risk of being insufficient and that Mr Mawhinney's personal indemnity is worthless". It was further said that Mr Williams' submissions "make comments as to the strength of the case made by the [a]pplicants in this proceeding in part to downplay the possibility that the [r]espondents will ultimately have to pay any costs to the [a]pplicants". It was put that those "features of the submissions are clear attempts to dispose the decision-maker to order a higher figure for the quantum of the security".
45 I do not read the submissions in that way. The particular passages pointed to by the applicants seem to me to be the sort of thing that might routinely be said by way of submission, absent any knowledge of an opponent's personal circumstances or predilections. But in any event it would be difficult to imagine how such submissions could be relevant to the task to be performed by the Judicial Registrar here.
46 Likewise, I do not agree with the submission put by the applicants that Mr Williams "will have the distinct advantage of knowing Mr Mawhinney's priorities, vulnerabilities, appetite to risk, and access to financing". As I said above, even assuming that Mr Williams was told some detail in relation to such matters at the mediation, in my view they are not relevant to the task of the Judicial Registrar.
47 For the same reasons, I do not accept the applicants' submission that the Judicial Registrar's assessment of the quantum of the security "goes back to Mr Mawhinney's resources".
48 I should also mention one other submission advanced on behalf of the applicants. It was submitted that Mr Williams' written submission that the quantum of security should be rounded up from $4 million to $5 million to provide "a buffer" indicated that the amount of the security being sought was possibly relevant to something that was discussed in the course of the mediation about Mr Mawhinney's "vulnerabilities, appetite for risk, financial resources, finances and what he might do with the results of that mediation if the matter were settled".
49 I do not accept that submission. It is apparent on the face of Mr Williams' written submission that the submission that some "buffer" be required is said to be necessary because "estimates of future legal costs not uncommonly prove to be too light". Likewise, although the applicants sought to make something of the parenthetical observation made in paragraph [42] of the written submissions - that is, that Mr Mawhinney's personal indemnity "may well have no value to the extent that it is unsecured" - it seems to me that it is the sort of observation that cannot be seen to have the requisite nexus with the nature of the confidential information said to have been disclosed at the mediation. It will of course be a matter of the Judicial Registrar to form a view about it, if it comes to it, but an issue would surely arise as to the relevance of such an observation to the task at hand, in any event.
50 It follows, in my view, that there is also no real risk of misuse of the confidential information.
51 It follows that the answer to questions five and six is "no" and that the application to restrain Mr Williams on the first ground contended for must fail.
52 The applicants also relied on the court's inherent jurisdiction to ensure the due administration of justice, citing, by way of example, Sent v John Fairfax Publication Pty Ltd [2002] VSC 429 and Grimwade v Meagher [1995] 1 VR 446.
53 The submission was put in this way:
The Applicants accept that the jurisdiction of the Court to restrain a practitioner on this basis is "exceptional" and "to be exercised with appropriate caution" [citing Geelong School Supplies Pty Ltd v Dean (2006) 237 ALR 612; [2006] FCA 1404 at [35] (Young J)]. However, the principle that justice is both done and seen to be done is no small matter. Mr Williams KC represented Mr Mawhinney at a mediation. At that mediation, Mr Mawhinney discussed with Mr Williams KC the matters the subject of the dispute in this proceeding. Mr Williams KC now acts for the very party on the other side of that dispute. Regardless of any ability of Mr Williams KC to use that information on the issue of the quantum of security for costs, does that appear just? The principle that justice is both done and seen to be done should be upheld in particular in relation to legal practitioners acting against former clients, perhaps now more than ever. Any public perception that legal practitioners are able to "switch sides" should be eliminated.
54 As Lee J said in Porter v Dyer (2022) 402 ALR 659; [2022] FCAFC 116 at [116], there is a "potentially difficult question of whether the exceptional course of restraint could be appropriate, even where no real risk of misuse of confidential information was established". This is not the occasion to explore that potentially difficult question.
55 In my view, having concluded that there is no real risk that the confidential information in this case would be relevant to the exercise to be performed by the Judicial Registrar, and that there is no real risk of misuse of confidential information, I am not satisfied that the fair-minded, reasonably informed member of the public would conclude that the proper administration of justice requires that Mr Williams be restrained from acting for the respondents at the hearing on Wednesday.
I certify that the preceding fifty-five (55) numbered paragraphs are a true copy of the Reasons for Judgment of the Honourable Justice O'Callaghan.