Followed by 'The Spitfire Story' by Dr. Alfred Price and, if you can find it, the 1960s Harleyford book 'Spitfire - Story of a Famous Fighter', I think by Bruce Roberstson (sorry,lost my copy after lending it out, so not sure on author.)
The Morgan/Shacklady book is the 'Bible' as far as technical detail, production etc is concerned, and is excellent, whilst the other two are more 'readable', if that makes sense?!