My natural predisposition would be to be more forthcoming. Unfortunately, we do have a set of policies and principles relating to national security confidence that we have followed historically, as do other services of our sort, in terms of what we will or will not convey publicly.
With respect to the issue of whether or not more could be conveyed in camera, I would just quickly say two things. Among my many deficiencies, I'm not a lawyer. Given that the whole issue of national security confidence is before the courts, I would have to seek the advice of legal counsel as to whether or not this would be feasible.