“(1) Information which is not exempt information by virtue of section 30 is exempt information if its disclosure under this Act would, or would be likely to, prejudice – [….] (g) the exercise by any public authority of its functions for any of the purposes specified in subsection (2), [….] (2) The purposes referred to in subsection (1)(g) to (i) are – (c) the purpose of ascertaining whether circumstances which would justify regulatory action in pursuance of any enactment exist or may arise, […]”