Established in 1999, Elefire core services are the Administration and Management of Firewalls and Intrusion Detection systems. We currently provide management services for Checkpoint Firewall-1, Netscreen and Cisco Pix, though we can offer leading-edge Open Source solutions at a lower cost and a higher Service Level. Areas serviced: Central Londonwww.elefire.com3rd Floor/St. Jamess House/23 King St, SW1Y 6QY

Cheaters Investigation Ltd is an established professional international detective agency, aimed to offer personal surveillance services to private individuals, companies and the legal profession at a competitive low price. We provide our clients with high caliber surveillance operatives, who acting independently are able to gather the facts quickly, and video the facts as they are, or are not happening. Areas serviced: Central Londonwww.cheatersltd.com59 Rupert St, W1D 7PN

We are different because our approach is different; it's implicit in everything we do, it's the reason why customers come back to us, it is the thing that makes us what we are. It's why we have been voted the "Best". We are trusted by the UK's leading local authorities, police forces, rail companies and many other commercial organisations to secure their people, premises and assets. Areas serviced: Central Londonwww.atec-security.co.ukUnit 11/10-11 Archer St, W1D 7AZ

Court Security is a long established firm of security specialists based in the heart of London's west end. We specialise in all aspects of physical security from a basic mortice lock up to the latest technology in intruder alarms and CCTV. Our shop boasts some of the most advanced key cutting equipment available. Areas serviced: Central Londonwww.courtsecurity.co.uk9-12 St. Annes Court, W1F 0BB

Box89 is a London based investigation firm specialising in the discreet and detailed background checking of individuals. Our clients are primarily from the private equity and venture capital community. We are a member of the British Venture Capital Association, reflecting our involvement in conducting due diligence and management referencing on a number of key private equity transactions both in the UK and overseas. Areas serviced: Central Londonwww.box89.com12 St. Jamess Sq, SW1Y 4RB

UC Associates Worldwide Ltd is a National and International investigation company offering a professional service to clients across a wide range of specialised fields. Through our highly skilled and experienced personnel, consisting of ex New Scotland Yard detectives, we provide a level of investigative expertise which is unrivalled. In addition, with access to sophisticated equipment and technology, it is no surprise that our results are excellent. Areas serviced: Central Londonwww.ucassociates.co.ukMayfair House/14-18 Heddon St, W1B 4DA