- Answers Investigation
 - Croydon - Private detective services for the South of England. Services include debt recovery, tracing, and investigating residential areas for homebuyers. - APC Services Credit Management
- Kingston-upon-Thames - Consultancy providing advice and guidance on credit reports, credit insurance, outsourcing, affinity marketing, and purchasing card solutions.
- Blackhawk Investigations
- Commercial and private investigations agency based in London, offering their services to law firms, businesses, and individuals.
- Carratu International
- Sutton - Investigation and fraud prevention consultancy provides blue chip clients around the world with specialist investigation services.
- Central Investigations London
- Camden - Private investigation and detective agency.
- Hoopers International Probate Genealogists
- Islington - Specialises in locating missing beneficiaries.
- ICSM
- Croydon - Provides credit information, debt recovery services, and free legal advice on credit problems.
- Julie-Ellen Headley Family Research
- Bexley - Provides a family ancestry service.
- Metropolitan Investigations
- Westminster - Private detective/investigation agency serving London and the South East.
- Nationwide Investigations Group
- Southwark - Serves the legal profession, commerce, industry and the general public in all areas of civil, criminal and personal matters.
- No Hiding Place Ltd
- Barnet - U.K. based, internationally operating, private investigator and detective agency that charges only for results.
- Peter O'Donoghue Research
- Westminster - Offers a range of business history services from research and archiving to writing histories, preparing presentations, and other public relations material.
- Risk Advisory Group Limited
- Camden - Provides corporate investigations and business intelligence and screening services.
- SIP Services International
- Westminster - Offers corporate and private investigations, protection, debugging, surveillance, forensic, and polygraph testing.
- South East Investigations
- Westminster - Supplies a range of specialist services to private, corporate, and legal clients.
- Title Research
- Camden - Legal genealogists specialising in identifying and locating missing beneficiaries on behalf of executors.
- WM Associates
- Harrow - Offers security, investigation, and information services to the legal profession, insurance companies, financial institutions, and personal clients.
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