What happened
On 15 April 2026 the Home Office published the statutory guidance for the Terrorism (Protection of Premises) Act 2025. It explains who is in scope, how to work out the number of people reasonably expected to be present, the standard tier procedures (evacuation, invacuation, lockdown and communication) and the enhanced tier measures.
Three non-statutory supplementary documents followed: A on methods for assessing how many people may be present, B with illustrative scope examples, and C on further resources and learning. Accessible versions were added in April and May 2026.
Responsible persons must have regard to the statutory guidance, so it is the main reference for what reasonable compliance looks like.
What to do now
- Work out your capacity figure using the methods in supplementary document A.
- Start drafting your four procedures, or use a pack to create them from guided questions.
Read next
Official sources
Martyn's Law Risk Assessment is independent and not affiliated with the Home Office or the Security Industry Authority. This update is general information, not legal advice.