Despite months of writing and checking, and rechecking, it turns out that someone else who does proof reading for you will spot things that you've become blind to!
As a result I'll issue an updated ebook to Amazon and Google. If you've purchased the books already you should be able to get updates automatically at no extra cost.
As ever, if you make significant contributions to the book, you'll get the next edition free.
UPDATE - I've updated both Amazon and Google's stores with the latest round of corrections. I'm trying to get the book into Barnes and Noble's Nook store too.