When does Martyn’s Law come into force? And how much time do you really have to prepare?

The headline is a 24-month implementation window after Royal Assent. In practice, the preparation runway is shorter than the headline suggests. This page walks through each key date and what it means for your premises.

The Terrorism (Protection of Premises) Act 2025 received Royal Assent on 3 April 2025. From this point, the Act became law.

Royal Assent does not mean enforcement began. It means the Act is on the statute book and the clock toward enforcement started ticking.

The Home Office and the regulator published statutory guidance in April 2026. The guidance provides the practical detail around:

• How public protection procedures should be structured
• What the regulator will look for on inspection
• How “reasonably practicable” is interpreted in specific contexts
• Enforcement processes and penalty bands

Statutory guidance is where the abstract requirements of the Act become concrete operational standards. Preparation work already underway still counts (the principles of the Act are clear), but organisations should now align documentation with the published guidance.

The government committed to a minimum 24-month implementation window between Royal Assent and enforcement. That puts the earliest possible enforcement date at April 2027.

Implementation period means:

• The Act is law, but penalties don’t apply yet.
• Organisations in scope should be actively preparing.
• Statutory guidance (published April 2026) sets the operational detail.
• The regulator prepares its inspection capacity.

From April 2027, the regulator will begin enforcing duties under the Act. Enforcement means:

• Inspection powers
• Penalty notices for breaches
• Ultimately, criminal penalties for serious or persistent non-compliance

The date is the earliest possible start. If inspection capacity takes longer to stand up, enforcement may push later. Organisations should not plan on the basis of a delay.

Two factors shorten the practical preparation window:

1. Implementation takes longer than expected

Preparing purpose-built procedures, training staff (with turnover), running an exercise, and packaging evidence is a multi-month process even for a single-site premises. For multi-site organisations (retailers, hospitality groups, multi-academy trusts, denominational bodies), it’s a coordinated programme of work that can take 6 to 12 months.

Starting in January 2027 to be ready for April 2027 is not realistic for anything beyond the smallest single-site premises.

2. Statutory guidance requires alignment

With statutory guidance published in April 2026, organisations that prepared early may need to adjust documents, procedures, or evidence formats to align with the finalised detail. The adjustment is much faster than starting from scratch. Organisations that waited for guidance before starting face the full preparation work in a compressed window.

If your premises is in scope, start preparation now:

1. Scope confirmation. Are you in? Which tier?
2. Procedures drafted. Purpose-built to your premises.
3. Training rolled out. Staff on the procedures.
4. Exercise run. Procedures tested in practice.
5. Evidence packaged. Kept current.

With a purpose-built platform, this can be done cleanly in months, not years. Without one, it’s typically a scramble.

The fastest way to know is our free Am I in Scope? tool. A handful of questions, a clear answer, no account needed.

If you already know you’re in scope, Get Started with Prova Risk to prepare your public protection procedures, train your staff, and keep the evidence you’ll need if inspected. £399 per year per site.

• When Does Martyn’s Law Come Into Force?
• Is Martyn’s Law Mandatory?
• Why You Should Start on Martyn’s Law Now
• Origins and Purpose of the Act
• What Is Martyn’s Law?