Duty of Confidentiality in UK Law

The fiduciary relationship which subsists between solicitor and client comes to an end with the termination of the retainer. Thereafter the solicitor has no obligation to defend and advance the interests of his former client. The only duty to the former client which survives the termination of the client relationship is a continuing duty to preserve the confidentiality of information imparted during its subsistence.

It is a duty to keep the information confidential, not merely to take all reasonable steps to do so. But he is entitled to prevent his former solicitor from exposing him to any avoidable risk; and this includes the increased risk of the use of the information to his prejudice arising from the acceptance of instructions to act for another client with an adverse interest in a matter to which the information is or may be relevant.

We consider that it is arguable that a duty of confidentiality that has been expressly assumed under contract carries more weight, when balanced against the restriction of the right of freedom of expression, than a duty of confidentiality that is not buttressed by express agreement – contrast the observations of Walker LJ in London Regional Transport v The Mayor of London [2001] EWCA Civ 1491 at paragraph 46 with those of Lord Donaldson of Lymington MR in Attorney General v Barker [1990] 3 All ER 257 at p.260.

I start with the broad general principle (which I do not intend in any way to be definitive) that a duty of confidence arises when confidential information comes to the knowledge of a person (the confidant) in circumstances where he has notice, or is held to have agreed, that the information is confidential, with the effect that it would be just in all the circumstances that he should be precluded from disclosing the information to others.

It is that the principle of confidentiality only applies to information to the extent that it is confidential. In particular, once it has entered what is usually called the public domain (which means no more than that the information in question is so generally accessible that, in all the circumstances, it cannot be regarded as confidential) then, as a general rule, the principle of confidentiality can have no application to it.

For these reasons, the test to be applied when considering whether it is necessary to restrict freedom of expression in order to prevent disclosure of information received in confidence is not simply whether the information is a matter of public interest but whether, in all the circumstances, it is in the public interest that the duty of confidence should be breached.

The statutory powers given to the police are plainly coupled with a public law duty. The precise extent of the duty is, I think, difficult to define in general terms beyond saying that the powers must be exercised only in the public interest and with due regard to the rights of individuals. In the context of the seizure and retention of documents, I would hold that the public law duty is combined with a private law duty of confidentiality towards the owner of the documents.