Kalyx (which runs Harmondsworth) parent company Serco

Private companies such as Kalyx (which runs Harmondsworth) & Serco

Kalyx - A business with global connections
http://www.kalyxservices.com/kalyx.htm

We provide a full range of services to Home Office Departments - National Offender Management Services, the Immigration Service and the National Probation Service. With our partners we design, build, finance and operate custodial, immigration and post-release establishments.

We are part of a very large, stable and growing international family, whose primary aim is to improve the quality of daily life of all those we serve.
Our parent company, Sodexho Alliance SA, is the world's leading provider of food and management services. With more than 313,000 employees in 76 countries, the Group reported consolidated sales in excess of £9 billion last year.
It provides services to Corrections Departments in eight countries on three continents, from food services to design, construction, finance, multi-service and total management including security. Sodexho is committed to the well-being of offenders both during and after custody.