Schedule 23, Part 5, paragraph 3(3)

The security measures referred to in sub-paragraph (2)(a) are— measures to ensure the physical security of the premises, including the installation of alarm and detection systems, and the retaining of documentary evidence of those measures, measures, which are evidenced in writing— to prevent unauthorised access to, or loss or theft of, a high-activity or similar source, to detect such matters, and to review and enhance the physical security of the premises in response to any increased risk of unauthorised access, loss or theft, written procedures to ensure that before a person is authorised to have access to a high-activity or similar source— that person has passed checks to verify their identity, and satisfactory written references have been obtained which confirm, as far as reasonably practicable, that there is no information to indicate that the person presents any security risk to the sources, and measures to keep secure, and prevent unauthorised access to, information relating to— a high-activity or similar source, and the measures referred to in paragraphs (a), (b) and (c).

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Source: legislation.gov.uk · retrieved 2026-07-30