Schedule 20, Part 5, paragraph 18(2)

If and to the extent that the old certificate provides protection with respect to personal data which corresponds to protection that could be provided by a certificate issued under section 27, 79 or 111 of this Act, the old certificate also has effect to that extent after the relevant time as if— it were a certificate issued under one or more of sections 27, 79 and 111 (as the case may be), it provided protection in respect of that personal data in relation to the corresponding provisions of this Act or the UK GDPR, and where it has effect as a certificate issued under section 79, it certified that each restriction in question is a necessary and proportionate measure to protect national security.

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Source: legislation.gov.uk · retrieved 2026-09-04