In most respects this is very like the similarly themed U-Boat book, differing only in how it's organised - chronologically, as opposed to in descending order of grade - and the shorter time-span it covers, April to December, 1940, as opposed to the whole war. Each entry succinctly synopsises the life and career of the recipient, whilst also giving a brief account of their part in the Battle of Britain.
Copiously illustrated in black and white throughout, with a short additional photo section towards the end, this is ideal for dipping into. Again, if this is your primary area of interest a cover to cover read might be in order. But for me it's a case of occasionally having a glance through, and cherry picking a few entries. This makes it eminently suited to workplace reading, if one's job allows occasional time-outs, as mine occasionally does.
A fascinating and informative resource.
 Sorry, couldn't resist the pun!
 In these cases the first entry is the fuller account, the second being very cursory.