GUIDANCE

Martyn’s Law

Terrorism (Protection of Premises) Act 2025

A proportionate framework for improving preparedness and public protection at certain premises and qualifying events in the UK.

Royal Assent: 3 April 2025 Implementation period: at least 24 months
Understand the essentials
AT A GLANCE

The essentials

The duties are intended to be proportionate to the premises or event. The key distinction is between the standard and enhanced tiers.

200–799

Standard duty

Focuses on notification, public protection procedures and proportionate preparedness.

SIA

Regulator

The Security Industry Authority is the regulator identified under the Act.

This page provides general information only. Exact definitions, exemptions, commencement dates and duties should always be checked against official guidance.

WHO MAY BE IN SCOPE?

Publicly accessible premises and events

The Act applies to certain premises and qualifying public events. A premises is generally considered against three core tests.

01

It is a building with a use listed in Schedule 1.

02

It can reasonably expect 200 or more people at the same time from time to time.

03

It is not excluded by Schedule 2.

EXAMPLES MAY INCLUDE
Stadia & arenas Town squares Markets & festivals Retail & hospitality Leisure venues Public-facing event spaces

Education settings and other specific premises may be subject to different treatment under the Act. Check the legislation and statutory guidance for the exact position.

DUTIES BY TIER

What changes between standard and enhanced?

Both tiers focus on proportionate public protection. Enhanced premises and qualifying events carry additional requirements.

STANDARD DUTY 200–799 people
  • Notify the SIA that you are responsible for the premises.
  • Have appropriate public protection procedures in place.
  • Ensure relevant people understand what to do if an attack occurs.
  • Keep proportionate evidence of decisions, briefings and reviews.

The source material notes that this tier does not itself require physical security upgrades.

ENHANCED DUTY 800+ people
  • Implement appropriate public protection measures where reasonably practicable.
  • Document procedures and measures for the SIA.
  • Explain how measures reduce vulnerability and risk of harm.
  • Where required, appoint a Designated Senior Individual.

Qualifying public events may also fall within the enhanced regime.

PRACTICAL READINESS

Four questions worth asking now

Even during the implementation period, organisations can review how well their current procedures, evidence and site planning are structured.

01

Understand your site

Review public access, crowd movement, vulnerabilities and relevant threats.

02

Define procedures

Consider evacuation, invacuation, lockdown and communication arrangements.

03

Keep evidence

Maintain proportionate records of decisions, briefings, exercises and reviews.

04

Review when things change

Revisit plans when the site, event, operations or threat picture changes.

OFFICIAL GUIDANCE

Check the latest position before acting.

For definitive scope, commencement dates, statutory guidance and compliance requirements, use official UK Government and ProtectUK sources.

SITE PLANNING

Need to review vehicle access and mitigation options?

See how Sentinel can support site assessment, hostile vehicle scenario testing and mitigation planning.

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