The more hardened stalwarts around here will be all-too-familiar with this documentary, but if you haven't seen it, you really owe it to yourself to do so:
BBC - Archive - WWII: The Battle of Britain - Spitfire! | Two Seconds to Kill
Synopsis
Raymond Baxter, a former fighter pilot himself, talks to some of the men who built and flew the plane that played a key part in preventing the invasion of Britain in 1940. We learn how the Spitfire narrowly escaped being called the Shrew and find out about the significance of the elliptical wings. Douglas Bader explains the flying tactics Spitfire pilots used against Messerschmitts and Gordon Mitchell recalls his father Reginald, who designed the plane but died before it went into full-scale production.
It includes interviews with TPs, engineers and plenty of interesting footage.