There has been some debate in recent months as to whether the Mark 1 Spitfire was ever fitted with the engine-driven hydraulic undercarriage system. I for one am quite convinced that it was. It is clearly present in the Mk.1 Spitfire (R6692) featured in the IWM film. But this was not convincing enough for everyone. A little light reading at tea time this evening provided a bit more evidence:   From 'Spitfire - A complete fighting history by Dr Alfred Price. Excerpts from Chapter 2 - In