The Terrorism (Protection of Premises) Act 2025 — Martyn's Law — moves the responsibility for public safety at UK venues from good intention to statutory duty. From April 2027 the Security Industry Authority will enforce clear obligations for standard-tier premises (200–799 capacity) and enhanced-tier premises (800+). A well-designed Public Address and Voice Alarm (PA/VA) system is now one of the single most effective tools for meeting those duties.
Why PA/VA Sits at the Heart of Martyn's Law
Under an attack, seconds decide outcomes. Written procedures and staff radios are not enough on their own — every person on the premises needs a clear, unambiguous instruction the moment a threat is identified. A BS 5839-8 compliant PA/VA system provides pre-recorded and live speech messages across zones, over the sound of a busy venue, and continues to operate on standby batteries when mains power fails.
- Reach: intelligible speech in every part of the building, including toilets, stairwells, back-of-house and external areas
- Speed: single-button activation of pre-scripted protocols by trained staff
- Control: zoned messaging so different areas receive different instructions simultaneously
- Resilience: fire-rated cabling, monitored loudspeaker circuits and dual-path power
Four Protocols, One Integrated System
1. Rapid Communication
Everyday operational announcements — last orders, gate changes, lost children — build staff and public familiarity with the system. Confidence in the voice on the speakers is what makes emergency messages effective.
2. Lockdown
A distinct pre-recorded lockdown message directs occupants away from entrances, into secured spaces and away from glazing. Integrated with access control, the same activation drops perimeter doors to a fail-secure state and inhibits fob release on inner zones.
3. Invacuation
Where the threat is external — a marauding attack in the street, a vehicle-borne threat outside the venue — evacuating occupants into danger is the wrong response. Invacuation messages hold people inside, move them to internal refuge zones and give staff time to co-ordinate with police.
4. Evacuation
Where the threat is inside, BS 5839-8 phased or simultaneous evacuation messages take over, co-ordinated with the fire alarm cause-and-effect so occupants receive one consistent instruction rather than competing signals.
Design Considerations for UK Venues
- Speech intelligibility: STI/CIS testing to prove ≥0.5 STI in every listener area, per BS EN 60268-16
- Zoning strategy: aligned with escape routes, refuge areas and the venue's threat response plan
- Message library: reviewed with counter-terrorism security advisors (CTSAs) and rehearsed with staff
- Integration: single network with the fire alarm, EVCS (BS 5839-9), access control and CCTV — reducing infrastructure cost and eliminating conflicting alerts
- Cyber resilience: segregated VLANs, signed firmware and physical key-switch overrides on activation panels
Preparing for Enforcement
Enhanced-tier premises must document a "reasonably practicable" reduction in the risk of physical harm. A commissioned PA/VA system with tested lockdown, invacuation and evacuation protocols is one of the most defensible measures a responsible person can put in place. Standard-tier venues, while facing lighter duties, benefit from the same infrastructure at a proportionate cost when it is designed alongside existing life-safety systems.
We design Martyn's Law-ready PA/VA schemes across Bristol, Bath, the South West and beyond — integrating Vox Ignis Unicorn Voice, LexiComm and other leading platforms with the fire, access control and CCTV systems your venue already relies on. Contact our team for a compliance-focused site survey ahead of the 2027 enforcement window.
Talk to a Local Engineer
If you would like honest advice, a clear written quote, or help with compliance paperwork,get in touch with our team. We are a small, experienced South West team, and we look after every customer properly — no pushy sales, no hidden extras, and documentation you can rely on.
