So today we were threatened with legal action by a disgruntled publisher who wanted us to stop reviewing their books. They wrote that if we did review any more of their titles, they would "seek legal remedies on the grounds that your publication is publishing misinformation" about their books. Meaning we don't like them very much. On the phone, I was told by the publisher that we (or any review media) need permission from them (or any publisher) in order to review their titles.
All I can say is that their grasp of the law seems to equal their grasp of what makes a good book for children.