With nearly two decades of highly rated service, AOS is one of the leading security companies in the UK. AOS recently achieved a score of 163 following the Security Industry Authority ACS audit, which places AOS in the top 1% of companies in the Approved Contractor Scheme for the second year running.

Access Buzzers is a door/intercom specialist company with over 10 years of experience installing and maintaining door entry systems, intercoms and Access Control throughout London and the South East. Access Buzzers have a wealth of experience in all sectors providing their services to corporate, educational, private, health care and retail industries.

Access Key and Lock is one of the largest online lock suppliers in the U.K. Access Key & Lock are not just a web based company as they also have four retail shops located in Southampton, Bournemouth, Fareham and Portsmouth which enables them to offer a full locksmith and security service to the Hampshire and Dorset area.

Access-Ability UK Ltd was founded in 1999 by the current MD Rick Allan and Mark Walker, who at the time, was employed by PAC International. The strong connection with PAC was the catalyst for creating a company to design, install and maintain high end access control systems. Access-Ability UK Ltd have the necessary depth of experience and skills, to establish effective security installations for all types of business.

Ad Hoc Property Management offers property security solutions to European market leaders. The company protects vacant properties using the Property Guardian model, ensuring such properties are not left to become derelict. Ad Hoc offers solutions for threats such as squatting and asset stripping through socially responsible property protection.

AD Porta are a dedicated railway security specialist. They are currently providing security to major rail projects in the London area as well as trackside security during upgrade and enabling works.

ADB Alarms have been been installing security and alarm systems for more than 25 years. The company was founded by Managing Director, Alan Bennett, who has been in the security business since 1980, so you can be sure you are in safe hands. The company continually stay up-to-date with the latest security and fire alarm technologies, so the customers are assured of the highest levels of security and safety at all times.

Adetel SIE is a global leader in providing electronic solutions for embedded deployments. Available as individual equipment or complete systems for new designs or upgrade programs, their products are designed for the stringent requirements of the embedded world. This includes video surveillance systems, communication systems, public address, passenger information systems and if needed, custom made system to meet specific customer requirements.

ADJ Fire and Security are providers of Intruder Alarm Systems, CCTV and Fire Safety Systems. The Fire products are compliant with British Standards, such as BS5839-1:2013. ADJ also offers services like integration with fire, access control to release doors in the case of a fire, gas suppression systems, paging systems.

ADP Security Systems provides electronic systems as well as manned guarding in Hampshire, Sussex, Surrey, Dorset and Berkshire. The company's forté is in tailoring a mix of flexible security elements, covering static manned guarding, mobile, electronic/CCTV and physical security.

Based in Chiswick, Advanced Laser Imaging is a world leader in use of advanced laser scanning and photogrammetry techniques to create accurate, immersive, 3D environments with wide range of policing, criminal justice, security, military and asset management applications. Advanced Laser Imaging introduced new applications for laser scanning that helped provide effective security planning and support for events and incidents in the UK and abroad.

Advanced Overwatch are one of Northern Ireland's leading CCTV System, Burglar Alarm and Security System installation companies offering the latest in security technology, installed by expert engineers.

Advanced Security Systems UK Ltd is a company which, by understanding the principles of threat and risk assessment, combined with the desire to deliver the best quality installations, have achieved a reputation for providing cost effective, high quality security solutions. Technical Excellence, Integrity and Enthusiasm’

AVS provide a full range of products ranging from small household security systems through to more complex networked, digital, IP and wireless systems for large companies and government institutions.

Advanced Wiring Solutions provides innovative systems and cabling solutions tailored to fit your needs by offering a consistent quality of service, rapid response time, quality of workmanship, and by utilising the latest technology in the industry.

Advanosys Security and Automation Technologies is a full service Systems Integrator providing a very wide offering of all security, automation, life-safety and disaster prevention. Advanosys offer complete designed, installed, managed/monitored and supported solutions to an equally wide range of clients to meet all types of security and automation requirements.

Based from the head office in Gateshead, Advantex Network Solutions are the provider in Mitel, IT Solutions, Networking, and iP surveillance in the North East. Established in 2002, Advantex has evolved with the speed and change of technology; growing from a small cabling company with 5 employees to become the North East's IT, Communication & Security solutions provider employing over 60 local employees.

Aegis Group is a total Security and Facilities management company. At Aegis Group they offer a full range of security and facilities management services, from basics like Manned Security Guarding, cleaning, to high-end specialist services like Asbestos Removal and disposal.

Aeon Systems Limited is a privately owned company established in 1999. Its core business is the supply, installation and maintenance of electronic security systems. The company provide services to support the customers to maximise their quality security systems installation.

Africa Security Forum is a membership-based government organisation, located in Barking, United Kingdom. They provide policing, counter terrorism, border defence, local, state, national security services.

Founded in 2015 Agility Technologies Corporation is focused on the development and adaptation of digital technology and manifesting it into real world products for the emergency and security services. As active participants in the Rescue, Military and Industrial communities we listen and act on the input of our customers with a goal to develop equipment that allow them to adapt, improvise and overcome challenges that will improve outcomes.

Agri-cctv Ltd provides security solutions for rural and farming communities, providing tools to protect home or business. The company provides solutions based on intruder alarm, CCTV, remote security, tracking, automation, security lighting and IP secure installations.