(1) A head may refuse to grant a request under section 7 in relation to a record (and, in particular, but without prejudice to the generality otherwise of this subsection, to a record to which subsection (2) applies) if, in the opinion of the head -
(a) access to the record could reasonably be expected to have a serious adverse affect on the financial interests of the State or on the ability of the Government to manage the national economy,
(b) premature disclosure of information contained in the record could reasonably be expected to result in undue disturbance of the ordinary course of business generally, or any particular class of business, in the State and access to the record would involve disclosure of the information that would, in all the circumstances, be premature, or
(c) access to the record could reasonably be expected to result in an unwarranted benefit or loss to a person or class of persons.
(2) This subsection applies to a record relating to -
(a) rates of exchange