What is the test for identifying a defamatory article?

Counsel for the plaintiffs points out that the fact that an ordinary member of the public reads a defamatory article and is unable to identify the plaintiff will not save the defendant if a limited audience could make that identification. This has been established in: It must often happen that a defamatory statement published at large does not identify any particular person and that an ordinary member of the public who reads it in its context cannot tell who is referred to. But readers with special knowledge can and do read it as referring to a particular person. (Morgan v. Odhams Press Ltd. and another, [1971] 2 All E.R. 1156, at p. 1159) This has been enlarged upon: It is not necessary to show that everyone to whom the words were published would understand that the plaintiff was the one to whom it referred., if those who know the plaintiff would reasonably understand that it referred to him or her, or if reasonable persons who are aware of facts and circumstances extrinsic to the defamatory words would conclude that the plaintiff is the person to whom the words referred. Nor will the fact that those intimately acquainted with the plaintiff would conclude that he was not the one referred to, if those who knew him less intimately would. (The Law of Defamation in Canada, (Second Edition) Volume 1, supra, pp. 6-39)