Thank you America
And not so much the UK
That said, one of the regrets I have about my book is that I was too timid in describing the target audience. I hope it's useful to anyone who's got a solid understanding of Plone from a user/administrator perspective, and who has a solid understanding of web development and a decent grasp of Python. Alas, I think some people have bought the book with no prior knowledge of Plone, and found it frustrating. If so, I apologise!