Action Counters Terrorism
NaCTSO's public awareness campaign encouraging the reporting of suspicious activity, together with the free ACT Awareness e-learning package for frontline staff.
Why it matters
ACT Awareness is the recognised free training route for staff counter-terrorism awareness and is the practical baseline for Standard Tier Martyn's Law staff training. Bookable online through the ProtectUK platform.
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Automatic Number Plate Recognition
A camera-based technology that reads vehicle number plates and matches them against watchlists or access lists.
Why it matters
ANPR is commonly used at school and campus vehicle entrances, car parks and delivery yards. Under UK GDPR it is a significant data processing activity that requires a lawful basis, a documented retention period and clear signage.
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Alarm Receiving Centre
A secure, 24/7 monitoring facility that receives alarm signals from remote sites and takes agreed action, typically to BS EN 50518.
Why it matters
The ARC is where an alarm actually gets responded to. A monitored intruder alarm, a detector-activated CCTV system or a lone-worker device is only as good as the ARC behind it, so the ARC's grading, response protocols and police URN status all matter.
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Closed-Circuit Television
The umbrella term for video surveillance systems, whether analogue or, more commonly today, IP-based network cameras.
Why it matters
The legacy of the analogue CCTV era is that clients often assume all systems are broadly the same. Modern IP-based CCTV differs significantly in image quality, network security, storage architecture and integration with access control, and specification matters.
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Hostile Vehicle Mitigation
Physical security measures designed to prevent or reduce the impact of vehicle-borne threats, including bollards, planters, active road blockers and vehicle security barriers.
Why it matters
For sites likely to fall within Enhanced Tier scope of Martyn's Law, or those hosting public events, HVM is often part of the proportionate security assessment. Specification should reference an impact rating (IWA 14 or PAS 68/BSI PAS 170) rather than appearance alone.
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Internet Protocol
The network protocol that underlies almost all modern security systems. An IP camera is one that transmits video over a computer network rather than as an analogue signal.
Why it matters
IP-based systems bring the benefits of network technology (remote access, high resolution, integration) and also its risks (cyber security, network dependency). Any specification for IP CCTV should include the cyber security posture, not just the camera count.
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Network Video Recorder
The dedicated device or server that records and stores video from IP cameras on a network.
Why it matters
The NVR determines how long footage is retained, how quickly it can be searched and exported, and how resilient the recording is to failure. Retention should be documented in the site's UK GDPR retention schedule.
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Passive Infrared
The most common motion detection technology used in intruder alarms and lighting controls. Detects the change in infrared radiation caused by a warm body moving through a monitored area.
Why it matters
PIR detectors are inexpensive and effective indoors but have known limitations (line-of-sight, false triggers from heat sources). More critical detection points often combine PIR with microwave or dual-technology detectors to reduce false alarms.
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Power over Ethernet
An IEEE 802.3 standard that allows Ethernet cabling to carry electrical power alongside data, powering devices like IP cameras, wireless access points and access control readers from the network switch.
Why it matters
PoE dramatically reduces installation cost and disruption because devices need only a single cable rather than separate power supplies. Modern PoE++ (802.3bt) supports higher-power devices including PTZ cameras and heaters.
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ProtectUK
Technical Terms
ProtectUK
The Counter Terrorism Policing digital platform providing protective security advice, training and, in due course, Martyn's Law guidance and support tools for the Responsible Person.
Why it matters
ProtectUK is the official source that all Martyn's Law preparation should reference. Any supplier's guidance, including ours, should be a proportionate interpretation of what ProtectUK sets out, not a substitute for it.
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Public Switched Telephone Network
The traditional analogue and copper-based telephone network in the UK.
Why it matters
Openreach is phasing out the PSTN in favour of digital voice services. This directly affects intruder alarms, fire alarms, lift lines and door entry systems that rely on analogue signalling, all of which need migration planning to digital signalling paths before the switch-off completes.
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Video Management System
The software platform that manages CCTV cameras, recordings, users and integrations.
Why it matters
The VMS is the operational heart of a modern CCTV system. Its cyber security posture, integration capability and user management directly affect how a site actually uses its cameras day to day.
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