In my opinion, a power to grant a permit subject to conditions authorises the responsible authority to grant a permit for a use or development which differs from the use or development the subject of the application for a permit, provided that the difference is not so radical as to enable it to be said, viewing the matter broadly and fairly, that to grant a permit on the supposed conditions would not be to grant the permit applied for with modifications, but to grant a different permit. This is plainly a matter of degree, and indeed it is almost one of impression. In my view, the changes made may be considerable without necessarily bringing it about that the permit granted is a different as opposed to a modified permit. Whether more may be countenanced by way of limiting the development or use, as opposed to extending it, before the point is reached at which alteration ceases to be modification and becomes transformation, is a question which I find it unnecessary to decide. On this question fairness and convenience may point towards one conclusion and logic towards another. [Emphasis added]