Established in 1998, Racam Security & Communications Ltd. specialises in the design, supply, installation, commissioning and maintenance of many types of security and communications systems. Racam Security & Communications' systems range from domestic intruder alarm systems to large public space CCTV systems and include police, local authorities, casinos and defense contracts.

Radio Data Networks has established itself as the UK's largest provider of licenced radio links and smart sensors for applications such as sewer monitoring where it currently delivers over 200-million messages per annum over its Ofcom licenced band that covers the whole of the UK from Northern Ireland right down the to Channel Islands of Jersey and Guernsey.

Radio Data Technology went into liquidation on 13th August 2013 and now AMG Systems is manufacturing RDT products. AMG Systems is a leading UK manufacturer and global provider of video and communication transmission solutions designed for CCTV surveillance operations in transport, public, government and military sectors.

Radio Physics has spent several years inventing and augmenting millimetre wave radar technology to effectively and accurately detect concealed threats at distances up to 30 metres. In doing so, Radio Physics has become the world leader in standoff concealed threat detection, reliably detecting PBIED's (bomb vests), Assault Rifles, Machine Pistols and large bladed weapons.

Radiocoms Systems Ltd offer their customers a total communication system: specialist teams that combine a wealth of engineering knowledge and unwavering support to deliver a powerful tool that addresses varied businesses challenges, boosts efficiency and enhances the overall safety practices.

Raidocontact Ltd is a manufacturer and installer of specialist security and communication systems. Radiocontact's client base includes airports, banks, government establishments, hospitals and railways. The company manufactures closed circuit television, house security systems and specialized fabrication of panels as well as controls.

Radiotronics is a supplier of two-way radios and radio communications accessories.

Formed in 2004, Radius Security Systems Ltd is a North West security expert and provider of door supervision and event security. Radius Security Systems Ltd covers a wide range of areas throughout the North West and Yorkshire. Radius Security Ltd holds SIA approved contractor status for the provision of Door Supervision. Radius Security Systems operates mainly in the commercial, industrial and public sectors of London and the South East.

Raidiam provides modern, flexible, IAM solution which helps organization to improve customer experience and satisfaction. Raidiam also provides guidance that will reduce ongoing costs, reduce time-to-market and deliver a consistent model cross the web, mobile and API channels.

Rainbow provides a range of IP and analog security solutions.

Incorporated in 1977, Rainbow Security Systems is part of Rainbow Electrical & Security Systems Ltd. Based in Northampton, England, Rainbow Security Systems specialises in the installation and maintenance of intruder alarms systems to domestic dwellings. Its clientele includes the premier national house builders David Wilson Homes, Westbury Homes, Persimmon Homes, Charles Church Homes and King of Oak Homes.

RAM are one of the UK's largest and leading suppliers of telescopic posts, security bollards and security barriers. Availavbe nationwide, all RAM products are high quality engineered products, designed to be durable, effective and long-lasting. The range of RAM's client base is a diverse as the need for security barriers from construction sites to shopping centres and car parks.

Rampart Security Ltd are installers of Security Systems to British Standard 4737 ISO 9000 and NACOSS. Rampart Security is an established business with over 12 years experience in the security industry. With extensive expertise and knowledge, the company designs, installs, and maintains, a comprehensive range of security systems to suit customer needs.

Ramtech is the UK’s renowned wireless systems technology specialist, delivering innovative safety and security solutions for leisure and industrial applications. Their cutting-edge systems are engineered to deliver the highest standards of legislative compliance while meeting the unique safety challenges of complex environmental conditions from rail depots to banks, power stations to construction sites.

RandomStorm is based on over 30 years combined professional experience in IT security technology. The company offers a comprehensive range of scanning, monitoring, alerting and remediation consultancy services exclusively through its network of specialist security partners. Based in the UK the company has developed a range of on demand scanning services to meet the security requirements for any size organization.

Ranger Fire & Security delivers consistent world-class Fire & Security services through a one-stop integrated in-house platform across the UK.

Rapid Action Security is a private security service in the United Kingdom, based in Leeds, committed to providing unrivalled commercial and residential security solutions. They are a reliable and trusted security solutions provider with a committed and reliable workforce.

Rapide Security & Surveillance Ltd. is the Midlands leading installer of commercial security systems, house alarms, automatic and manual fire alarms, closed circuit television systems, door access control, as well as fully integrated solutions including personnel attack and hold up alarms. Rapide Security & Surveillance is a NSI “Gold” approved installer of security systems and is also certified to the international quality standard ISO 9001.

Rapidrop Global Limited is a UK-based manufacturer of fire sprinkler system products with international sales and distribution serving the needs of the fire detection and suppression industry. Their dedicated, skilled supply and engineering teams pride themselves with providing extensive experience and knowledge in assisting clients with the selection and supply of accredited, competitive, value for money solutions.

Ravelin provides sophisticated technology and dedicated support to help online businesses prevent advanced fraud threats and accept payments confidently.

Raven Security Solutions Ltd offer all kinds of security services tailored to your companies individual needs to protect your staff premise and stock.

RAW Fire has a crew of skilled technicians who can design, supply, install, commission, maintain and monitor fire and security systems for customers, ranging from independent schools and commercial/industrial businesses through to the public sector.

Since 1985, Raysil Security Systems Limited has been designing and installing integrated security systems to the highest industry standards, collecting certifications - NSI, LPS 1014, ISO 9001-2000 and approvals - police authorities, home office, major insurers - along the way.

Raytec are a specialist manufacturer of CCTV lighting and ANPR hardware. Raytec provide a complete range of World leading Infra-Red and White-Light illuminators for the CCTV professional. All our illuminators offer industry-leading performance with low running costs and low maintenance.

Raytel Security Systems is a wholly owned subsidiary of the Raytel Group Limited established in 1980 as a holding and central services company for Rayleigh Instruments Limited (Est.1964) and Raytel Security Systems Limited (Est.1979). Raytel's product portfolio displays a variety of door entry systems & access control equipment. In addition, the company also offers CCTV systems.

RazorSecure are specialists in rail cyber security, providing solutions for rolling stock and signaling environments. RazorSecure software has been deployed in over 1600 rail vehicles and protected over 30 million rail passenger journeys.