This is one of the most useful reference books I've ever read. The history section is brilliant. I have always been bemused by the British assortment of Kings/Queens and all the drama that encircled each (other than Henry VIII, that is, numerous books have been read in the quest for knowledge about him).
This book cut through the clutter and delivered simple facts which were easy to digest and remember. It placed each monarch in context with the events of the day and brought clarity where previously I found confusion.
There is a lot more to this 2014 edition but the history portion was my favorite. The rest of the book was a solid effort as well. It provided a wealth of information about Wales, Scotland, Ireland, criminal/civil law, elections, sport, inventions, writers, etc which enabled me to pass the test today.
This book is much more rounded in information delivery than the 2012, 6th edition (based on the 2006 handbook). I read that one as well and found it to be more rooted in Labour party propaganda than useful fact. Stick with this one. It's a winner!