The HS125-800 first flew on May 26 1983 and it introduced a number of improvements. Aerodynamic changes included a reprofiled nose and windscreen, extended fin leading edge, and greater span wing which decreased drag and increased lift and fuel capacity. Range was boosted further by a larger ventral fuel tank. More powerful TFE-731s improved field performance, while a redesigned interior made more efficient use of the space available. The 800 was also the first corporate jet to feature an EFIS cockpit and is now available with the Collins Pro Line 21 avionics suite. The 800A was specifically aimed at the US market, the 800B for non US markets.
The 125-800 became the Hawker 800 from mid 1993 when Raytheon purchased BAe's Corporate Jets division. Production has been transferred to Wichita in the USA (the first US built 800 flew on November 5 1996, the last UK built 800 on April 29 1997).