The spinners and spinning wheels book came from a second hand bookshop for 50p and has lots of detailed historical and a little practical info and is very easy to read. Hands on spinning by Lee Raven is a little bit too simplified (good if you want to learn to spin without asking too many questions). However the Alden Amos is fantastic, its for anyone who's got a scientific/engineering mind and has to understand exactly how its put together and works before being able to do something themselves without getting frustrated. I've got it sussed and can't wait to have a 'proper' go with the wheel later.
speaking of which ... here she is my Kromski symphony (hasn't got a proper name yet)