I expect many people have already heard about this or got a copy but:
"The Vegetative Key to the British Flora Kindle eBook is FREE to buy today (30 August) only on Amazon thanks to John Poland's kind offer"
This is an excellent book, and I have used it to confirm species when in flower as well as when leaves is all there is to be seen. Many of the details in the book I have not seen in print ( or e-book) anywhere else.
Its still there today - sadly my phone isn't compatable with the kindle IPhone app!
I've just been to look, and it's not free anymore, but at what I presume is the standard price of £24.99.
If it had been still free I would have grabbed a copy for my tablet, rather than carry the paper copy.