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Section 90 shall have effect— a in relation to any act done before the appointed day, as if the reference to section 24 were a reference to section 19 of the Northern Ireland Constitution Act 1973 so far as relating to a member of the Northern Ireland Executive or other person appointed under section 8 of that Act or a Northern Ireland department; b in relation to any act done before the commencement of section 76, as if the reference to that section were a reference to section 19 of that Act so far as relating otherwise than as mentioned in sub-paragraph (a); and c in relation to any such act as is mentioned in sub-paragraph (a) or (b), as if— i the reference in subsection (1)(b) to a certificate were a reference to a certificate purporting to be signed by or on behalf of the Secretary of State and certifying that an act specified in the certificate was done for the purpose of safeguarding national security; and ii subsection (3)(b) were omitted.