Welcome to the home page of PSI Ltd, a specialist investigation service for companies, organisations and Public Authorities.

PSI Ltd was set up by John Dwyer, a retired Assistant Chief Constable of Cheshire Constabulary to provide a specialist investigation service. Using a network of 400 retired, time-served police officers throughout the UK, all with proven high level investigative experience, PSI Ltd advise companies and local authorities on loss prevention and detection.

We offer three services;

• Investigations into the activities of employees, customers or associates where you suspect something may be wrong.
• Security Testing where we identify the gaps in your physical or IT security and advise you how to fill them.
• Specialist investigations into complaints against Members of Public Authorities received by the Standards Board for England.