What is the standard of review for disclosure of an anonymous letter?

The issue relating to the disclosure of the anonymous letter is one which involves procedural fairness. This Court has held that when dealing with the issue of extrinsic evidence, the judge does not need to engage in an assessment of the appropriate standard of review but should evaluate whether the rules of procedural fairness have been adhered to: see Edobor v. Canada (Minister of Citizenship and Immigration), 2007 FC 883, 65 Imm. L.R. (3d) 199, at paragraph 23. Procedural fairness raises a question of law, reviewable on a standard of correctness, and, as such, I find the standard applicable to this issue to be one of correctness: Dunsmuir v. New Brunswick, 2008 SCC 9, [2008] 1 S.C.R. 190.