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National security (including the Security Service, the Secret Intelligence Service and the Government Communications Headquarters); special powers and other provisions for dealing with terrorism or subversion; the Technical Advisory Board provided for by section 245 of the Investigatory Powers Act 2016; the subject-matter of— a the Official Secrets Acts 1911 and 1920; b the subject-matter of sections 3 to 10, Schedule 1, Part 2 and Chapter 1 of Part 6 of the Investigatory Powers Act 2016, except so far as relating to the prevention or detection of serious crime (within the meaning of that Act); c the Official Secrets Act 1989, except so far as relating to any information, document or other article protected against disclosure by section 4(2) (crime) and not by any other provision of sections 1 to 4.