The photos in Secrets of the Spitfire are old, original, but good.
As well as the unseen Type 224 shots, there is an 1894 photo of Sir Frederick Lanchester with his elliptical wing with washout - decades before Heinkel was credited with an ellipse in the He 70.
Pictures of Lippisch at work too.
Very rare, very nice.
Cat amongst pigeons with this one I should imagine.