I consider that although there is a class of documents whose members are entitled to protection from disclosure irrespective of their contents, the protection is not absolute, and it does not endure for ever. The fundamental and governing principle is that documents in the class may be withheld from production only when this is necessary in the public interest. In a particular case the court must balance the general desirability that documents of that kind should not be disclosed against the need to produce them in the interests of justice. The court will of course examine the question with especial care, giving full weight to the reasons for preserving the secrecy of documents of this class, but it will not treat all such documents as entitled to the same measure of protection - the extent of protection required will depend to some extent on the general subject matter with which the documents are concerned. If a strong case has been made out for the production of the documents, and the court concludes that their disclosure would not really be detrimental to the public interest, an order for production will be made.
1. See Burmah Oil Co. Ltd. v Bank of England, [1980] A.C., at p. 1111, per Lord Wilberforce.
2. See Lanyon Pty Ltd v The Commonwealth (1974), 129 C.L.R. 650; Sankey v Whitlam (1978), 142 C.L.R., at pp. 39, 57, 97, 102, 108; Conway v Rimmer, [1968] A.C., at pp. 952, 973, 987, 993; Air Canada v Secretary of State for Trade , [1983] 2 A.C. 394, at p. 432.
3. (1978) 142 C.L.R., at p. 43; see also pp. 63-64, per Stephen J. and pp. 98-99, per Mason J.