This week in Martyn's Law: the SIA steps up, and clarity on scope

Published 26 October 2026

The regulator is laying the groundwork for its role, fresh material explains who is in scope, and the retail sector is starting to work through what preparation looks like. Here is what stood out and why it matters.

The SIA and its role as regulator

Several updates this week focus on the Security Industry Authority (SIA), which will act as the regulator for Martyn's Law. New material covers how the SIA is planning for its new duties and what its role will involve. There is also reporting on the outcome of recent SIA inspections, which gives a sense of how the organisation works today. For venues, the key point is simple: the SIA's notification process is not yet live, and the duties are not yet in force. This is background to understand who you will deal with in time, not a call to act now. Use the quieter period to get familiar with the regulator and its approach.

Scope and who is covered

Fresh guidance sets out the scope of the Act and explains the "principal use" of premises, which helps work out how a site is classified. As a reminder of the stable facts: the standard tier covers premises where 200 to 799 people may reasonably be expected at the same time, and the enhanced tier covers 800 or more. That count includes staff. Working out your likely tier is a sensible early step. Material on principal use is useful where a site has mixed activities and the classification is less obvious.

Support, momentum and what's next

Government material this week talks about keeping up the momentum and about the support available as the regime develops. Alongside the core text of the Terrorism (Protection of Premises) Act 2025, these updates point to a steady flow of help for operators ahead of commencement. Nothing here changes the timeline: the duties are expected to commence in spring 2027, and the exact date is still to be confirmed. Treat this as a familiarise-and-prepare phase rather than a deadline to race against.

The retail sector starts to engage

A video from Mondaq looks at how Martyn's Law may affect retail. It is a sign that individual sectors are beginning to think through what preparation means for their own settings. Retail sites vary widely in size and layout, so the practical picture differs from place to place. If you run a retail venue, it is worth watching how your sector interprets the requirements as more sector-specific discussion appears.

What this means for your venue

The direction of travel is clear: the regulator is preparing, and the guidance picture is filling out. None of this is enforceable yet, and none of it is a substitute for professional input on how the law applies to you. A calm approach works best. Confirm your likely tier, get to know the SIA's role, and keep an eye on sector updates. There is time to prepare well before the duties take effect.