Sch 1 para 2 Entry to Crown premises
(1) If the Secretary of State considers that in the interests of national security particular powers of entry must not be used in relation to particular Crown premises, the Secretary of State may certify that those powers must not be used in relation to those premises. (2) In this paragraph— “ Crown premises ” means premises held or used by or on behalf of the Crown; “ power of entry ” means a power of entry exercisable under section 108 of the Environment Act 1995 or regulation 30 of the Northern Ireland Regulations, in relation to a function under these Regulations.