I came across this by chance in a bookshop and, after a quick flick, bought it on the spot. What initially sold it to me was the section which directly compares various coffee chains such as Starbucks, Cafe Nero, Coffee Republic and Costa, and details how each of them fares in various ethical / eco friendly ways: I found it to be a complete revelation. I'm the sort of person who cares about things such as M&S only using free-range eggs in all their products, for example. The info in the book has been enough to make me boycott some companies and consciously choose to purchase products from others. If you've ever been interested in things such as the Nestle baby milk scandal, or have wanted to know which parent companies own smaller 'baby' companies (such as Coca Cola and Innocent smoothies being commercially linked) then this is the book for you.
The reason it gets 4* from me is because the only source given for ALL of the appraisals is 'The Ethical Company Organisation'. That's it - for the vast majority of ratings there is no elaboration on, say, what constitutes a bottom rating for 'human rights': just a red spot on the table. The book itself explains that a full red circle (the symbol for the bottom rating) means they have found 'the highest level of criticism and negative records' for the company, but I wish there was more room for elaboration, instead of appraisals being limited to only this vagueness. Obviously then the book would not be so concise, but for those readers with a deeper interest in these aspects may be left feeling that lots of questions are raised and never answered.
Oh, and if you are interested: Pret and Starbucks fared the worst.