(1) Where the information requested is comprised in a document and there is good reason for withholding some of the information contained in that document, the other information in that document may be made available by making a copy of that document available with such deletions or alterations as are necessary.
(2) Where a copy of a document is made available under subsection (1), the local authority shall, subject to section 8, give to the applicant—
(a) the reason for withholding the information; and