found: Wikipedia, 25 Mar. 2013:under London Ambulance Service (the London Ambulance Service (LAS) is a National Health Service trust that is responsible for responding to medical emergencies in Greater London; the present-day London Ambulance Service was formed in 1965 by the amalgamation of nine existing services in London and in 1974, after a reorganisation of the NHS, the LAS was transferred from the control of local government to the South West Thames Regional Health Authority; on 1 April 1996, the LAS left the control of the South West Thames Regional Health Authority and became an NHS trust)