s 97 National security, &c.
(1) An appeal under section 82(1) ... against a decision in respect of a person may not be brought or continued if the Secretary of State certifies that the decision is or was taken— (a) by the Secretary of State wholly or partly on a ground listed in subsection (2), or (b) in accordance with a direction of the Secretary of State which identifies the person to whom the decision relates and which is given wholly or partly on a ground listed in subsection (2). (2) The grounds mentioned in subsection (1) are that the person’s exclusion or removal from the United Kingdom is— (a) in the interests of national security, or (b) in the interests of the relationship between the United Kingdom and another country. (3) An appeal under section 82(1) ... against a decision may not be brought or continued if the Secretary of State certifies that the decision is or was taken wholly or partly in reliance on information which in his opinion should not be made public— (a) in the interests of national security, (b) in the interests of the relationship between the United Kingdom and another country, or (c) otherwise in the public interest. (4) In subsections (1)(a) and (b) and (3) a reference to the Secretary of State is to the Secretary of State acting in person.