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(1) Subject to subsection (2) below, at any planning Planning inquiry oral evidence shall be heard in public and documentary inquiries to evidence shall be open to public inspection. iad in (2) Subject to subsection (3) below, the Secretary of State may, Subject to in the case of any planning inquiry, direct that evidence of any exceptions description indicated in the direction shall not be heard or (as ° the case may be) open to inspection at that inquiry by anyone other than such persons or persons of such descriptions as he may specify in that direction. (3) The Secretary of State may give a direction under subsection (2) above only if he is satisfied — (a) that giving evidence of the description indicated or (as the case may be) making it available for inspection would be likely to result in the disclosure of information as to any of the matters mentioned in subsection (4) below; and (b) that the public disclosure of that information would be contrary to the national interest. (4) The matters referred to in subsection (3)(a) above are— (a) national security; and (5) the measures taken or to be taken to ensure the security of any premises or property. (5) In this section “ planning inquiry” means any local inquiry held under— (a) section 49(3) of the Town and Country Planning Act 1971 (inquiry held by a Planning Inquiry Commission); (6) section 282(1) of that Act (inquiry held for purpose of discharging functions of Secretary of State); or (c) paragraph 5 of Schedule 9 to that Act (inquiry held by person appointed by Secretary of State to determine appeal).