“[In] R. v Secretary of State for the Home Department Ex p. Salem [1999] 1 A.C. 450, where the HL held that it had a discretion to hear an appeal which concerned an issue involving a public authority as to a question of public law, even where there was no longer any live issue which would affect the rights and duties of the parties as between themselves. In Salem, Lord Slynn stated (at 457A): “The discretion to hear disputes, even in the area of public law, must, however be exercised with caution and appeals which are academic between the parties should not be heard unless there is a good reason in the public interest for doing so, as for example (but only by way of example) when a discrete point of statutory construction arises which does not involve detailed consideration of facts and where a large number of similar cases exist or are anticipated so that the issue will most likely need to be resolved in the near future.”