The Institute of Professional Investigators
www.ipi.org.uk/
Institute of Professional Investigators represents the interests of professional and private investigators in the UK and Worldwide.

UK Private Investigators I UK Private Detectives & Enquiry
www.nig.co.uk/
Private Investigator Private Detective UK, Nationwide Investigations Group provides professional and reliable investigation services in London

Private Investigator UK, Private Detective UK, Surveillance
www.findadetective.co.uk/
Local Quality Private Investigators UK, Private Detectives UK, Solicitors Agents UK, Enquiry Agencies UK, throughout the UK.