museum which is free to look around during a Duxford Airshow and includes many WWII examples. Airshow UK flying legends.. The Supermarine Spitfire first entered service in 1938 and remained in service throughout the war and beyond. Unlike America’s premier fighter, the P-51 Mustang, the Spitfire was continuously updated throughout its lifetime, producing a large number of different varieties, or "marks". One of the least common types is the Mk VIII, in fact this is the only one in Europe ...