In section 94 (authorisations given in absence of authorising officer), in subsection (2), after paragraph (f) insert—

“(fa)

where the authorising officer is within paragraph (ha) of that subsection, by a senior official (within the meaning of the Regulation of Investigatory Powers Act 2000) in the department of the Secretary of State by whom functions relating to immigration are exercisable who is designated by the Secretary of State for the purposes of this section;”.