Three things to keep in mind:
- The mission against the Dalek saucer was top secret, and all of the technology involved was destroyed shortly thereafter, so most likely only a handful of people knew about it.
- The Daleks showing up in 1941 changed history. Before history was changed, there were no Spitfires in space.
- Doctor Who is not real life, and the Whoniverse is not our universe, although it would be cool if it were.
- "Give 'em hell, Danny Boy! Vwoooooooooosh"