This does precisely what it says on the tin - it's a guide to good pubs in the United Kingdom (with some brief notes on pubs elsewhere on the planet).
The book strikes a whole sequence of sensible balances. The division of each chapter into long entries for the main recommended pubs, plus a more succinct "pot luck" section listing many more, is very wise. I am also pleased that character, atmosphere, beer, wine, food are given roughly equal billing as important aspects of a good pub.
I've checked many of my favourite pubs around the UK, and was generally impressed by how well the book's opinions matched my own. I've since visited many of the pubs it recommends, and not been disappointed. I've also casually compared its reviews with some competing books, and feel this is the best by a significant margin.
My biggest gripe is that personally, I'd like to see a little more information on the quality of soft drinks in pubs - the book will inevitably be used most by people when far from home, one of whom will very likely be driving!