"Waiver may be express or implied. Disputes as to implied waiver usually arise from the need to decide whether particular conduct is inconsistent with the maintenance of the confidentiality which the privilege is intended to protect. When an affirmative answer is given to such a question, it is sometimes said that waiver is 'imputed by operation of law'. This means that the law recognises the inconsistency and determines its consequences, even though such consequences may not reflect the subjective intention of the party who has lost the privilege. Thus, in Benecke v National Australia Bank (1993) 35 NSWLR 110, the client was held to have waived privilege by giving evidence, in legal proceedings, concerning her instructions to a barrister in related proceedings, even though she apparently believed she could prevent the barrister from giving the barrister's version of those instructions. She did not subjectively intend to abandon the privilege. She may not even have turned her mind to the question. However, her intentional act was inconsistent with the maintenance of the confidentiality of the communication. What brings about the waiver is the inconsistency, which the courts, where necessary informed by considerations of fairness, perceive, between the conduct of the client and maintenance of the confidentiality; not some overriding principle of fairness operating at large."