(1) The Secretary of State may give directions to the occupier of any relevant premises requiring him to secure that the person identified in the directions-
(a) is not to have access to any dangerous substance kept or used there;
(b) is not to have, in such circumstances (if any) as may be specified or described in the directions, access to such part of the premises as is so specified or described;
(c) is not to have, in such circumstances (if any) as may be specified or described in the directions, access to the premises; or
(d) is not to have, in such circumstances (if any) as may be specified or described in the directions, access to any building or site of which the premises form part.
(2) The directions must be given under the hand of the Secretary of State.
(3) The Secretary of State may not give the directions unless he believes that they are necessary in the interests of national security.