16 Nor can it be inferred from the contents of the report that the substance of the advice was disclosed with the express or implied consent of the clients (the applicants) to another person. In Tirango Nominees Pty Ltd & Ors v Dairy Vale Foods Ltd 156 ALR 364, Mansfield J considered whether the privilege which attached to letters of instruction to an expert, was lost by reason of s 122(4) in circumstances where the letters were produced during the cross-examination of the expert. His Honour approached the issue by considering whether under s 122(4) the substance of the evidence had been disclosed with the express or implied consent of the clients (the applicants in the proceedings). His Honour looked at the expert report in order to see whether the letters of instruction had provided any foundation for the opinions expressed by the report or whether production of the letters of instruction was necessary as associated material to the report, in order to avoid an incomplete or misleading picture of the evidence. His Honour noted that the only material pointed to within the expert's evidence, which may have amounted to disclosure of the instructions given to him, appeared in paragraph six of the report, and in two brief passages of oral evidence during cross-examination. Paragraph six of the report read, "I have been requested by the solicitors ... to quantify the economic loss suffered by the applicants as a result of actions taken or not taken by Dairy Vale Foods". There was no detailed reference in the evidence to the nature of the letters of instruction or identification of any material contained in the instruction documents. Based on the extent of the material disclosed, his Honour found that it was not a "sufficient substantial disclosure" of any information so as to constitute a waiver of privilege. Accordingly, the claim for privilege was held to be properly maintained.
17 A similar approach has been taken in two other authorities to which the Court's attention was directed by the applicants on the present notice of motion. The first of these is ML Ubase Holdings Co Ltd v Trigem Computer Inc. [2007] NSWSC 859 where Brereton J said at [45]:
[45] In my opinion, service and tender of an expert witness's report in proceedings does not constitute a waiver of the privilege which attaches to communications between the expert and the solicitor who instructed him or her save to the extent that those communications are associated documents reasonably necessary to an understanding of the report. "Proper understanding" of a document or communication will sometimes, but not always, require that documents to which it responds or refers be available. It may very likely be so when the primary document becomes a summary or excerpt from an earlier communication, or responds to questions which are not themselves restated in it. But I do not accept that "a proper understanding of the communication or document" involves an appreciation of the manner in which the opinions contained in the document have been formed over time, or the iterations and evolutions through which they have passed. The test is concerned with the comprehensibility of the primary communication or document: if it can be completely or thoroughly understood without more, then access to the related communications or documents is not reasonably necessary."
18 In the second authority, New Cap Reinsurance Corporation Ltd (In Liq) & 1 Or v Renaissance Reinsurance Ltd [2007] NSWSC 258, White J said at [53] [54]:
53 The question is not merely whether it could be said that the privileged materials were used in such a way that they could be said to influence the content of the report, but whether it could be said that they influenced the content of the report in such a way that the use or service of the report would be inconsistent with maintaining the privilege in those materials, such as, where it would be unfair for the party to rely on the report without disclosure of those materials. Where an expert's report is submitted to a party's legal advisers so as to be put into a form which will ensure that it is admissible, it can be said that the privileged communications between the expert and the lawyers have influenced the content of the report, in the sense of its form, although not in the sense of the formulation of the substantive opinions expressed by the expert. Likewise, privileged communications between an expert and the party's lawyers whereby material information is provided to the expert in the form of assumptions or documents may well influence the content of the report. However, an expert's report is required to state what material and assumptions are relied on. Use of a final report, which refers to such materials and assumptions, is not inconsistent with maintaining confidentiality in the communications which produced the final product.
54 Having considered the documents in respect of which privilege is claimed, I do not consider that it could be said that they have influenced the content of the final report in such a way that the service or use of the report would be inconsistent with maintaining confidentiality in the privileged materials.
19 Returning to the present proceedings, Mr Mansfield's report makes no reference at all to Mr Smallbone's advice. In cross-examination, Mr Mansfield said that he neither relied upon, nor read, the advice when preparing and completing his report. The Court has no basis for disbelieving Mr Mansfield's evidence on this point or in any way finding that his evidence was unreliable. In cross-examination, Mr Mansfield explained that he has a detailed familiarity with the industry in which the applicants operated and was capable of providing valuations of the machinery (in this case, a truck) and the business which was what he was instructed to do when preparing the report, without recourse to extraneous material. In the report he states that he reached his conclusions as a result of, "a familiarity with the cartage business and accounting principles concerning profit determination". Based on these matters I therefore accept Mr Mansfield's evidence in its entirety. It was not suggested by the first respondent that the letter of advice was reasonably necessary to an understanding of the report, (as to which, see s 126 of the Evidence Act). Moreover, in contrast to the circumstances before Boland J in Cahill v New South Wales (DCS), no inference is capable of being drawn from the contents of the report as to the substance of the advice. Even if a comparison of the two documents yielded a similarity or similarities, a competing rational inference is available that the two documents relied independently on a common source, for example, the statement of the second applicant which was one of a number of documents sent by Anderson Lawyers on behalf of the applicants to Mr Mansfield under cover of the letter of 13 March 2003. (I note however that that statement is undated.)
20 I therefore find that there has been no imputed waiver of the privilege attaching to the letter of advice by reason of the provision of Mr Mansfield's report to the first respondent.
21 The Court makes the following Orders: