- Security domain
- Intelligence
- What it is
- security intelligence agency · agency (level 3)
- Founded
- 1909
- Statutory basis
- Security Service Act 1989
- Public mandate
- Protects the UK, its citizens and interests, at home and overseas, against threats to national security.
- Acknowledged by
- Security Service Act 1989 (statute)
- Active headcount
- 5,385 (2023) official, high confidence
- Headcount source
- Intelligence and Security Committee of Parliament: Annual Report 2023–2025
- Website
- www.mi5.gov.uk
- Identifiers
- factbase.org/org/65AA32SH75 · Q210175