Martyn's Law
The everyday name for the Terrorism (Protection of Premises) Act 2025, which asks larger UK venues and events to prepare for a terrorist attack.
Martyn's Law is the popular name for the Terrorism (Protection of Premises) Act 2025. It is named after Martyn Hett, one of the 22 people killed in the 2017 Manchester Arena attack, and was campaigned for by his mother, Figen Murray.
It asks those responsible for larger publicly accessible premises and events to be better prepared to keep people safe: simple public protection procedures at the standard tier, and additional measures at the enhanced tier. It is sometimes mis-spelled as Martin's Law or Martins Law.
Who it affects: Anyone running a venue or event where 200 or more people may be present at once.
Related terms
Terrorism (Protection of Premises) Act 2025
The formal name for Martyn's Law — the UK Act of Parliament that creates the duties on premises and events.
Standard tier
Premises where 200 to 799 people may reasonably be expected at the same time. Requires simple, low-cost public protection procedures.
Enhanced tier
Premises or events where 800 or more people may reasonably be expected. Requires procedures plus additional measures and documentation.
See where your venue stands
The free readiness checker gives you an indicative tier in about five minutes, with the reasoning and the official guidance it rests on.
Run the free check →What this is — and what it is not
martynslaw.app is a preparation and document-management tool. It is not legal advice, not official guidance, not official certification, not SIA approval and not a guarantee of compliance. The responsible person must review and approve all documents before use.
martynslaw.app is an independent product. It is not affiliated with, or endorsed by, the Home Office, the Security Industry Authority or any other public body. Official sources are cited as sources only.