British Rail Train-Crew Manual - Push - Pull Trains and Driving Van Trailers - Drivers General Information, Driving Instructions, Drivers Static Duties
 and Drivers Fault Finding Data.
Issue Date September 1990  -   BR 33056/296    -   Issue 1.

More information can be found here Wikipedia - BR Driving Van Trailer
Information relating to privately owned AC Locomotives can be found here -   The A C Loco Group & Electric Traction Ltd.