I don't often write book reviews or recommendations. However, since 2015 is the 75th Anniversary of the Battle of Britain, 1940, I would like to suggest the following as a book worthy of consideration:
The Battle of Britain: Five Months That Changed History; May-October 1940 by James Holland
There are of course dozens of books on the subject and I have read quite a few. What I like about James Holland's book is the way he addresses all elements of the period May-October 1940 to set the air Battle of Britain in context. Holland discusses not only the military situation overall but also the political situation, the geopolitics (ie the USA), the leadership, the individuals who fought on the ground as well as in the air, on the home front as well as the front lines, the technology, economics and feelings of the time. I have never had a better understanding of all of these dimensions than in reading this book.
This is not your typical "Battle of Britain" book. However I really enjoyed the full perspective it gives on this fascinating time in modern history.