I was recommended this book by a friend and I'm very glad for it. The book is very easy to navigate (it's split into geographical sections - North London, West London, South West, Central etc), has a lot of photos (must have at least one for every pub) and even has maps of the different areas. The descriptions are interesting and give a good idea of what to expect inside the pubs.
Possibly the best feature is the choice of pubs. I now know a number of new pubs I'd not known about before and probably wouldn't have without this. Some real gems. I'm certainly not stuck for choices now when picking a place to enjoy a pint. The book has accompanied me on several nights and days out and is sure to get a lot of use in future.