Private Investigators UK
- Cheltenham based company for UK and international missing persons investigations, background checks and surveillance.
- http://www.uk-private-investigators.com/

Baker & Co.
- West Midlands, UK company with legal, commercial, industrial, finance and public services.
- http://bakerandco.net

British Agents
- Private investigator services for mainland Britain.
- http://www.britishagents.com

Southern Investigations
- Offers surveillance, tracing of missing persons and video/photographic evidence for matrimonial and insurance fraud.
- http://www.southern-investigations.com

Burton Regan
- Offers tracing, status enquiries, surveillance, statement taking and repossessions. West Yorkshire, England.
- http://www.burton-regan.co.uk/

Thames Associates
- Specialises in the commercial financial and industrial sectors. Describes its services and includes case studies. Based in Blackheath, .
- http://www.thamesassociates.co.uk/

Alexander Legal Services
- Providers of confidential services for surveillance, rent recovery and investigations in England.
- http://www.alexander-legal-services.co.uk/

John F. Hope & Co.
- Private investigators with offices in Worcestershire and Birmingham.
- http://www.c-pages.co.uk/johnhope/index.htm

Bastille Security Services
- Offering investigation, surveillance, staff training and advisory. Includes information on the services offered. Norfolk.
- http://www.bastillesecurity.com/

TAS Legal Services
- Private investigations, process serving and debt recovery. Hertfordshire.
- http://www.tas-legal.co.uk/

SIP Services International
- Tracing, surveillance, de-bugging and close protection. Describes services and includes contact details. London based.
- http://www.sip-international.co.uk/

International Intelligence Ltd
- Suppliers of covert surveillance, financial investigations and due diligence.
- http://www.int-int.co.uk/

Access Investigations
- Corporate intelligence, background reports, litigation support, tracing services and surveillance. Services and contact details.
- http://www.accesspi.co.uk/

A&B Associates
- Foreign security assignments, surveillance and maritime security. Services and contact details. Dorset based.
- http://www.ab-associates.co.uk/

SIASS
- Security, surveillance, investigations and legal support. London and Newcastle offices.
- http://www.siass.co.uk/

Pegasus Investigations
- Private and commercial investigation.
- http://www.pegasus-investigations.co.uk/

Peter Reay Security Consultants & Special Investigations Limited
- Full service investigative agency based in Richmond.
- http://www.peter-reay.demon.co.uk

Argyll Investigations
- Private investigator based in Scotland.
- http://website.lineone.net/~cplacido/

Grenadier Investigation Services
- Private detectives with offices in Derby and Nottingham.
- http://web.ukonline.co.uk/accisltd/

Anglo European Private Detectives Ltd.
- Private investigation firm based in Leeds.
- http://www.aepd.co.uk/

Global Intelligence Services
- Insurance fraud investigation, asset tracing, and strategic business intelligence. Based in Kent.
- http://www.gisvs.com/

Fintecs Investigation
- Liverpool based fraud and surveillance firm working for insurance companies, corporate,legal and private clients.
- http://www.fintecs.co.uk/

Kenyon Investigation Services
- Business, legal, fraud, employment and vehicle investigations, plus surveillance services. Includes services and profile.
- http://www.kenyons.org.uk/

LRI Research Ltd
- London based investigative firm.
- http://www.lri-research.com/

MC Eden & Associates
- Service to the legal and insurance professions, and to commercial clients.
- http://www.mceden.co.uk/

Richard Day & Wilson
- Corporate and commercial investigators, surveillance and undercover operations.
- http://www.e-rdw.co.uk/