What is Martyn's Law? Everything UK Venues Need to Know

The Manchester Arena Attack and Martyn Hett's Legacy

On 22 May 2017, a devastating terrorist attack at Manchester Arena claimed the lives of 22 people and injured hundreds more. Among those who lost their lives was Martyn Hett, a 29-year-old PR manager from Stockport who was known for his warmth, humour, and vibrant personality.

In the aftermath of this tragedy, Martyn's mother, Figen Murray, began an extraordinary campaign to ensure that no other family would have to endure what hers did. She called for legislation that would require publicly accessible venues to have protective security measures in place, arguing that better preparation could save lives.

Figen's tireless campaigning, which included walking from Manchester to London to raise awareness, garnered widespread public and political support. Her efforts culminated in the Terrorism (Protection of Premises) Act 2025, which received Royal Assent in April 2025. The legislation is widely known as Martyn's Law in honour of her son's memory.

Martyn's Law: The Terrorism (Protection of Premises) Act 2025

Martyn's Law is the widely-used name for the Terrorism (Protection of Premises) Act 2025. It is sometimes incorrectly referred to as Martin's Law. The legislation was passed by the UK Parliament and received Royal Assent in April 2025, making it a legal requirement for qualifying premises to have protective security measures in place.

The core purpose of Martyn's Law is to improve protective security at publicly accessible locations across the United Kingdom. It establishes a legal duty for those responsible for certain premises and events to take proportionate steps to protect the public from the threat of terrorism.

Compliance will be overseen by the Security Industry Authority (SIA), which acts as the regulator. The SIA will be responsible for issuing guidance, monitoring compliance, and taking enforcement action where necessary. Martyn's Law applies across England, Wales, Scotland, and Northern Ireland.

Which Venues and Businesses Are Affected?

Martyn's Law applies to any premises that are accessible to the public and have a capacity of 200 or more people. This includes a wide range of venues across the UK, from small community halls to large sports stadiums. The legislation divides these into two tiers based on capacity: Standard Duty (200-799 people) and Enhanced Duty (800 or more people).

Capacity is measured as the maximum number of people who could be present at any one time, including staff, visitors, customers, and any other persons on the premises. If your venue can hold 200 or more people, Martyn's Law almost certainly applies to you.

The types of venues and businesses affected by Martyn's Law include:

There are limited exemptions under Martyn's Law. Private dwellings, offices that are not accessible to the public, and premises with a capacity under 200 are generally exempt. However, if you host public events that bring your capacity above 200, temporary event requirements may apply.

Standard Duty vs Enhanced Duty: What's the Difference?

Martyn's Law uses a tiered approach to ensure that security requirements are proportionate to the size and nature of the venue. Smaller venues face lighter requirements, while larger venues must implement more comprehensive measures.

Key Dates for Martyn's Law Implementation

Martyn's Law has already been passed into law, but there is an implementation period before requirements become legally enforceable. Here are the key dates you need to be aware of:

Your Martyn's Law Compliance Checklist

Whether you're a small community hall or a large entertainment venue, here are the practical steps you need to take to prepare for Martyn's Law compliance. Starting early gives you the best chance of being ready well before the 2027 deadline.

What Happens If You Don't Comply with Martyn's Law?

Martyn's Law is not guidance or a recommendation. It is a legal requirement. The Security Industry Authority has been given clear enforcement powers to ensure compliance, and the consequences of failing to meet your obligations can be severe.

The SIA will have the power to issue compliance notices, requiring venues to take specific actions within a set timeframe. For persistent or serious non-compliance, the regulator can impose significant financial penalties. Fines are expected to be substantial, particularly for larger venues under Enhanced Duty.

In the most serious cases, the SIA may have the power to restrict or close venues that pose an unacceptable risk to public safety. Beyond the legal penalties, non-compliance carries significant reputational risks. Customers, event organisers, and insurers will increasingly expect venues to demonstrate compliance.

Insurance providers are also expected to factor Martyn's Law compliance into their assessments. Non-compliant venues may face higher premiums or find it more difficult to obtain public liability cover. Compliance is mandatory, not optional, and the cost of preparation is far lower than the cost of non-compliance.