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- Key facts, like the name of the designer and production figures are missing. See:
- page 48 of Bowyer's Supermarine Spitfire[[1]]
- pages 200 onwards of Butler's British Experimental Combat Aircraft of World War II[[2]]
- pages 252 to 255 of Roussel's book on Joe Smith[[3]]
- page 210 of Smith's British Built Aircraft: South West & Central Southern England[[4]]