- Peter Smith International Investigator
 - Services include missing persons tracing, surveillance, litigation intelligence, and travel security advice. - UK Research Bureau Limited
- Offers private investigator and detective services for corporate investigations. Find a missing person, hire spy surveillance equipment, or listening devices for business intelligence research.
- Check Mate
- Device for acquiring proof for divorce in spouse and partner infidelity cases using semen detection.
- Central Detective Agency
- Professional investigators, bailiffs, and debt recovery agents.
- MEC Investigations Division
- Due diligence, assets searches, litigation enquiries, background research, locate individuals, discover corporate structures. international.
- Carratu International
- Investigation and fraud prevention consultancy provides blue chip clients around the world with specialist investigation services.
- Answers Investigation
- Private detective services for the South of England. Services include debt recovery, tracing, and investigating residential areas for homebuyers.
- SoulSearch
- People tracing agency offering a free initial search for addresses and phone numbers of residents, lost friends, missing persons, and military veterans.
- Crown Associates
- Independent private investigators offering a range of specialist services.
- Gaskill's Investigation Services
- Approved agents to the legal profession and commerce.
- DetectivesUK.com
- Directory listing detective and investigation agencies.
- SIASS Investigation and Security Services
- Provides bodyguard, investigation, surviellance services, undercover operatives, legal support services, and chauffeur services. Based in Newcastle upon Tyne in the U.K.
- SIP Services International
- Offers corporate and private investigations, protection, debugging, surveillance, forensic, and polygraph testing.
- South East Investigations
- Supplies a range of specialist services to private, corporate, and legal clients.
- WM Associates
- Offers security, investigation, and information services to the legal profession, insurance companies, financial institutions, and personal clients.
- International Intelligence Limited
- Suppliers of specialist security services including surveillance, investigations, due dilligence, and counter espionage.
- Metropolitan Investigations
- Private detective/investigation agency serving London and the South East.
- UK Searches
- Provides search services for missing individuals and genealogy traces. Also allows the user to post messages and photos.
- Hides Detective Agency
- Services include surveillance, matrimonial investigations, credit card collection, affidavits, searches, and more.
- EuroEye
- Professional investigators and suppliers of specialist corporate surveillance equipment. Services include counter surveillance, video and audio transmitters, bugging devices, and more.
- Friar Investigations Limited
- Private detectives offering surveillance, divorce enquiries, tracing status enquiries, and more.
- LegalAppeal.co.uk
- Professional detectives dealing solely in criminal appeals, miscarriage of justice, and false allegation cases.
- Dating Detectives
- Provides an investigative service and security awareness for users of Internet based dating agencies.
- Able Investigation Services
- Providing surveillance, tracing, house detectives, warrant and process serving, and security consultancy.
- All Counties Investigations Ltd.
- Services include private investigation, process serving, manned guarding, and key holding.
- Allied Detectives
- A U.K. based private detective agency specialising in surveillance, tracing, and process services.
- Burton Regan Detective Bureau
- Firm of private investigators and detectives. Offers debtor trace, people searches, process serve, asset search, and legal support services.
- Crown Intelligence Investigations
- Private investigators based in London, offering a comprehensive nationwide and worldwide service.
- Xfor Security & Investigation Consultants
- Provides security and investigative services to both public and private sectors clients.
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