33 At this stage, I come back to the question of the application of s 122 of the Evidence Act to the issue before me. On Mr Shaw 's submission, s 122 applies by virtue of Pt 36 r 13 of the Supreme Court Rules . Mr Hall , on the other hand, put his submissions on the basis of the common law applying. In Telstra, the majority held that conduct which would have amounted to imputed waiver at common law came within the meaning of s 122(1) of the Evidence Act 1995 (Cth). Their Honours did not identify any difference between imputed waiver at common law and implied consent within the meaning of the sub-section. The majority said:
In our view, s 122(1) of the Act is to be construed as reaching to cases in which the client or party concerned is deemed to have consented to the disclosure of the otherwise privileged material in the sense discussed above. To constrain the operation of the subsection to instances of voluntary assent to the adducing of evidence which would otherwise attract client legal privilege is, in our view, to give insufficient weight to the context in which the subsection is found, and to the common law background against which the Act as a whole is to be understood. The primary judge expressed the view that, while "consent" in s 122(1) might include implied as well as express consent, it would be straining language excessively to hold that it extended to a "consent" imputed to a party on the basis of fairness. Presumably an implied consent, as envisaged by his Honour, is one that is found to be, on the evidence, real and voluntary though not express. In fact, however, the cases, not surprisingly, use the terms "implied" and "imputed" interchangeably (see, for example, Maurice at 488 per Mason and Brennan JJ, Goldberg at 95-96 per Deane, Dawson and Gaudron JJ and at 109 per Toohey J). Once it is accepted that consent for the purposes of the section extends beyond express consent, we think it should be taken to extend to imputed consent. In particular, if that were not so, a defendant ordinarily would no longer be able, where the plaintiff alleges that a transaction was procured by the defendant's undue influence, to lead evidence to the effect that the plaintiff had comprehensive legal advice, immediately before entering into the transaction as to its effect. We cannot believe that that was intended. It follows that, in such cases, the position has changed little, if at all, following the introduction of the Act.
34 The majority in Telstra was, of course, addressing s 122(1) of the Evidence Act 1995 (Cth). Mr Shaw submitted that the focus should be on s 122(4) of the Evidence Act 1995 (NSW). I have already noted that there is no relevant difference between the two statutes. Section 122(4) of the NSW Act differs from s 122(1) of that Act in that s 122(4) inquires whether there has been a consensual disclosure of "the substance of the evidence", save to the client's lawyer. However, in the light of the majority's observations quoted above in Telstra , it does not seem to me to make any difference whether Mr Shaw relies on s 122(4) or s 122(1) of the Evidence Act. In Telstra the majority relied on the underlying principle of fairness, which I consider would apply equally to s 122(1) and s 122(4). It could not be said as a matter of logic that the test of fairness applies to s 122(1) but not s 122(4). In any event, it would seem to me that s 122(4) applies more readily to the "disclosure waiver" category of cases rather than the "issue waiver" category of which the present case is one. In other words, where there has been consensual (either expressly or impliedly) disclosure of part of a confidential communication, the question may arise under s 122(4) as to whether there has been sufficient disclosure to warrant loss of privilege in respect of the whole of the communication. Issue waiver, on the other hand, is where a litigant opens up the source and basis for its belief on a particular question and inspection of any legal advice bearing on the belief cannot be denied on the basis of privilege.