Idoport Pty Limited v National Australia Bank Limited and 8 Ors; Idoport Pty Limited and Market Holdings Pty Limited v Donald Robert Argus; Idoport Pty Limited "JMG" v National Australia Bank Limited and Ors. [41]

In this case, the respondents, including National Australia Bank Limited and others, sought to adduce expert evidence from a witness, Mr. Donald Robert Argus, who was alleged to have specialised knowledge relating to New Zealand markets. The primary applicant, Idoport Pty Limited, opposed the evidence on the basis that Mr. Argus lacked the requisite specialised knowledge. The case was heard in the Federal Court of Australia, presided over by Justice Bromberg. The central issue before the court was whether Mr. Argus possessed the specialised knowledge necessary to qualify as an expert witness under the Evidence Act 1995, specifically in relation to New Zealand markets.

The court had to determine whether Mr. Argus's qualifications and experience were sufficient to establish his specialised knowledge in the context of New Zealand markets. The applicants argued that Mr. Argus did not have the requisite knowledge, having primarily worked in Australian markets and lacking direct experience with New Zealand markets. The respondents, however, maintained that Mr. Argus's extensive experience in financial markets, including his involvement in New Zealand markets, provided him with the necessary specialised knowledge. The court examined the evidence provided by Mr. Argus regarding his experience, qualifications, and understanding of New Zealand markets to assess whether he could be considered an expert witness.

Justice Bromberg concluded that Mr. Argus did not possess the specialised knowledge required to qualify as an expert in New Zealand markets. The court found that while Mr. Argus had substantial experience in financial markets, his involvement in New Zealand markets was not sufficient to establish the necessary specialised knowledge. Consequently, the court ruled that Mr. Argus was not qualified to give expert evidence on matters relating to New Zealand markets. As a result of this ruling, the respondents were unable to rely on Mr. Argus's proposed expert evidence in their case.