The Role of Lockdown Alarms in Martyn’s Law Preparedness

Where dedicated emergency alerting fits within a wider security procedure

The role of lockdown alarms is to help communicate an emergency procedure quickly and clearly when people may need to lockdown, invacuate, evacuate by a different route or restrict movement. The alarm supports the procedure; it does not decide the response and it does not make a premises compliant with Martyn’s Law by itself.

Hear Lockdown Alarm Sounds

Current legal position: the Terrorism (Protection of Premises) Act 2025 is law, but its substantive duties are not yet in force. The SIA currently expects commencement in spring 2027, with the exact date still to be confirmed.

What is the purpose of a lockdown alarm?

A lockdown alarm is a communication control. Its job is to warn the people who need to act and give the site’s planned response a clear starting point.

Distinct from the normal fire signal

A fire alarm and a security alert can require different actions. The lockdown signal should therefore be clearly distinguishable from the site’s normal fire-evacuation alarm and other routine sounds.

Linked to a written procedure

Staff need to know what the signal means and what they are expected to do. The sound or message only becomes useful when it is tied to a clear, practised procedure.

Fast enough to be useful

Activation should be practical for the people most likely to recognise an incident. Relying on one reception desk or one vulnerable location can introduce avoidable delay.

Designed for the actual site

Classrooms, workshops, halls, toilets, playgrounds, detached buildings and noisy areas can require different combinations of audible, visual or digital alerting.

Multiple activation points

The first person to recognise an incident may be nowhere near reception. Multiple suitable activation points can reduce dependence on one central location.

Depending on the selected system and site design, activation can include fixed call points, authorised portable triggers or approved software controls. The location and type of trigger should follow the emergency procedure and the situations in which staff may genuinely need to raise the alert.

  • Position activation points around realistic incident locations.
  • Make activation simple enough to use under pressure.
  • Control who can activate, reset or issue an all-clear.
  • Test the complete route from activation to the people who need to receive the warning.

Lockdown alarm sounds, voice messages and visual alerts

There is no single universal UK lockdown tone. The warning method needs to be distinctive, intelligible and understood by the people expected to respond.

Listen before choosing an alert

Camelott® publishes 32 alarm-tone samples together with guidance on tone, voice annunciation, fire-alarm distinction and controlled all-clear procedures.

Listen to the 32 Sounds

Distinctive tone

A dedicated tone can provide a simple warning, but people must already understand what it means and which procedure follows.

Voice annunciation

A short voice message can add context or instruction where the acoustics, procedure and chosen equipment make spoken information appropriate.

Flashing beacons

Visual alerts can supplement sound in noisy environments or where audible warning alone may not reliably reach everyone.

Digital notifications

Compatible systems can add desktop, monitoring, email or SMS functions where useful, but supplementary notifications should not become the only reliable on-site warning method.

Where wireless lockdown alarms can help

Wireless installation can reduce cabling and disruption, particularly on older, multi-building or fragmented sites. Radio coverage still needs to be assessed rather than assumed.

Less cabling

A suitable wireless design can reduce long cable runs, wall chasing and civil works compared with a comparable wired installation.

Multi-building sites

Detached blocks and external areas can be considered as part of the survey, with bridges or other compatible equipment used where the selected system supports them.

Expansion

Modular systems can allow compatible activation points, sounders, beacons or digital functions to be added later as the site or procedure changes.

Survey and commissioning

Building construction, distance, interference and ambient noise affect real-world performance. Coverage should be checked during design and commissioning.

Camelott wireless lockdown alarm diagram showing activation and alert devices

Example wireless lockdown alarm layout. Actual equipment quantities, positions and radio links depend on the site survey and selected configuration.

How lockdown alarms fit with Martyn’s Law

Martyn’s Law does not mandate a branded alarm system or a particular alarm tone. The technology is relevant only where it helps the responsible person implement suitable procedures.

The Act requires appropriate public protection procedures — including evacuation, invacuation, lockdown and communication — for premises and events in scope, so far as is reasonably practicable. Enhanced Tier premises and qualifying events have additional requirements for public protection measures and documentation.

A lockdown alarm does not make a site “Martyn’s Law ready” or compliant by itself. It may support the lockdown and communication parts of the plan where a dedicated alert is appropriate for the premises.

For the legal scope, thresholds and current implementation position, read Martyn’s Law Explained .

The role of lockdown alarms — FAQs

Does Martyn’s Law require a lockdown alarm?
No specific lockdown alarm product is mandated. The legislation requires appropriate public protection procedures and, for Enhanced Tier premises and qualifying events, additional public protection measures and documentation.
Should a lockdown alarm sound different from the fire alarm?
Yes, the signals should be clearly distinguishable where the planned responses differ. In education settings, Department for Education guidance says that where an existing alarm system is used for a threat alert, the threat signal must differ from the normal fire-alarm sound.
Is a siren or a voice message better?
Either can be suitable. A tone is simple and fast but depends on people already knowing its meaning. Voice annunciation can add instruction, but intelligibility, acoustics, message length and staff training matter. Some sites use both.
Can a lockdown alarm have more than one activation point?
Yes, where the selected system supports it. Multiple suitable activation points can reduce reliance on one central location and should be positioned around the site’s procedure and risk assessment.
Can wireless alarms cover separate buildings?
They can be designed for multi-building sites, subject to the system specification and survey. Distance, construction, terrain, interference and external conditions all affect coverage.
Is Martyn’s Law already in force?
The Act has received Royal Assent, but its substantive duties are not yet in force. The SIA currently expects commencement in spring 2027, with the exact date still to be confirmed.

Need to review how your site raises a lockdown alert?

Camelott® can review activation points, alert methods, buildings and the areas that need to receive the warning, then recommend a suitable system configuration. The equipment should support the organisation’s procedure, not replace it.

View Lockdown Alarm Systems Survey & Installation Contact Camelott®

General information only. Legal position checked against Home Office statutory guidance and SIA material available in September 2026. This is not legal advice.