I haven't had a problem with the accuracy and the usefulness of the information in this Lonely Planet guide to England. I have no complaints there. The prices and the opening times are right. The recommendations insightful and the options presented (more or less) clearly.
My only complaint is that the depth of information is quite limited and the maps don't often cover more than the very city town centre of most locations.
I can understand that the book can only be so big but really, who wants to carry around a chapter of England's history when you travel and then resort to a series of additional maps and guide information. If you're going to carry this great hunking book when you travel, take it to read as well as as your guide book and make the weight worth while.
Maybe Lonely Planet should consider increasing the quality of their printing so that the maps can be more detailed.