Looks like Amazon are going to start giving you the eVersion if you buy the physical book, starting in the US, hopefully it will come over here too.
Excellent! I really need to fill more bookshelf space ...oh, hang on a minute... I'm already swamped with tree versions....I can barely move...what with them and the old rugged cross which I've dusted off just in case....I'll put it back in the wardrobe for now. Damn! It's full of books!