Criterion (a) requires a comparison between access and no access (or increased access and restricted access) without reference to existing and likely future usage, and criterion (f) cannot be used to reintroduce considerations excluded from criterion (a).
The full text is available to signed-in members, including the 11 later cases that cite this judgment.
2 of the 11 citing cases carry a classified treatment. How each court treated it is available to signed-in members.