“[…] iii) A solicitor considering documents made available by the other party to litigation owes no duty of care to that party and is in general entitled to assume that any privilege which might otherwise have been claimed for such documents has been waived. iv) In these circumstances, where a party has given inspection of documents, including privileged documents which he has allowed the other party to inspect by mistake, it will in general be too late for him to claim privilege in order to attempt to correct the mistake by obtaining injunctive relief. v) However, the court has jurisdiction to intervene to prevent the use of documents made available for inspection by mistake where justice requires, as for example in the case of inspection procured by fraud. vi) In the absence of fraud, all will depend upon the circumstances, but the court may grant an injunction if the documents have been made available for inspection as a result of an obvious mistake. vii) A mistake is likely to be held to be obvious and an injunction granted where the documents are received by a solicitor and: a) the solicitor appreciates that a mistake has been made before making some use of the documents; or b) it would be obvious to a reasonable solicitor in his position that a mistake has been made; and, in either case, there are no other circumstances which would make it unjust or inequitable to grant relief. viii) Where a solicitor gives detailed consideration to the question whether the documents have been made available for inspection by mistake and honestly concludes that they have not, that fact will be a relevant (and in many cases an important) pointer to the conclusion that it would not be obvious to the reasonable solicitor that a mistake had been made, but is not conclusive; the decision remains a matter for the court. ix) In both the cases identified in vii) a) and b) above there are many circumstances in which it may nevertheless be held to be inequitable or unjust to grant relief, but all will depend upon the particular circumstances. x) Since the court is exercising an equitable jurisdiction, there are no rigid rules.”
“Cases of mistake are stringently confined to those which are obvious, that is to say those which are evident. This excites the question,: Evident to whom? The answer must be to the recipient of the discovery. If the mistake was evident to that person then the exception applies, but what of the case where it was not evident but what of the case where it was not evident but would have been evident to a reasonable person with the qualities of the recipient? In this context, the law ought not to give an advantage to obtusity, and if the recipient ought to have realised that a mistake was evident then the exception applies.”