- Richard Day & Wilson - Corporate and commercial invesigators, surveillance and undercover operations.
- Corporate Investigation Service, Ltd. - Private detective and security services.
- AM Investigations - Private investigation agency.
- MC Eden & Associates - Service to the legal and insurance professions, and to commercial clients.
- LRI Research Ltd - London based investigative firm.
- Kenyon Investigation Services - Business, legal, fraud, employment and vehicle investigations, plus surveillance services. Includes services and profile.
- ADM International - Services in computer forensics, copyright and trademarks.
- Fintecs Investigation - Liverpool based fraud and surveillance firm working for insurance companies, corporate,legal and private clients.
- Global Intelligence Services - Insurance fraud investigation, asset tracing, and strategic business intelligence. Based in Kent.
- Anglo European Private Detectives Ltd. - Private investigation firm based in Leeds.
- Grenadier Investigation Services - private detectives with offices in Derby and Nottingham.
- Argyll Investigations - Private investigator based in Scotland.
- International Legal Network Ltd - London detective agency providing a wide range of services.
- Peter Reay Security Consultants & Special Investigations Limited - Full service investigative agency based in Richmond.
- D.A.C. Group Ltd. - Investigators, collectors and civil enforcement agents based in Durham, England.
- Moore & Associates - Specialist risk consultants serving the corporate community.
- Pegasus Investigations - Private and commercial investigation.
- Ruthven & Co - Chartered accountants and certified fraud investigators in financial investigations. Includes an overview of the company and a list of services offered.
- SIASS - Security, surveillance, investigations and legal support. London and Newcastle offices.
- A&B Associates - Foreign security assignments, surveillance and maritime security. Services and contact details. Dorset based.
- Access Investigations - Corporate intelligence, background reports, litigation support, tracing services and surveillance. Services and contact details.
- International Intelligence Ltd - Suppliers of covert surveillance, financial investigations and due diligence.
- SIP Services International - Tracing, surveillance, de-bugging and close protection. Describes services and includes contact details. London based.
- Investigations and Special Tax Services (I.S.T.S.) - Inland Revenue prosecutions, Special Compliance Office, PAYE and NIC investigations. West Midlands.
- TAS Legal Services - Private investigations, process serving and debt recovery. Hertfordshire.
- Bastille Security Services - Offering investigation, surveillance, staff training and advisory. Includes information on the services offered. Norfolk.
- J J Associates - Commercial investigators and process servers.
- Tracetech - Tracing, process serving and personnel screening. Cambridge based.
- John F. Hope & Co. - Private investigators with offices in Worcestershire and Birmingham.
- Alexander Legal Services - Providers of confidential services for surveillance, rent recovery and investigations in England.
- Thames Associates - Specialises in the commercial financial and industrial sectors. Describes its services and includes case studies. Based in Blackheath, .
- Burton Regan - Offers tracing, status enquiries, surveillance, statement taking and repossessions. West Yorkshire, England.
- Southern Investigations - Offers surveillance, tracing of missing persons and video/photographic evidence for matrimonial and insurance fraud.
- Technical and Operational Resources - Offering surveillance, pattern of life studies, close protection services and satellite tracking. Based in Gloucestershire.
- British Agents - Private investigator services for mainland Britain.
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