From a purely sentimental POV, for me it's Roger A Freeman's 'Airfields Of The Eighth -Then & Now'

I bought it just after I passed my driving test and spent many happy weekends - and hundreds of miles - exploring the old airfields, poring over Ordnance maps and the aerial photos in the book. Those were the days when petrol was 30p per gallon, the roads were uncrowded and you could walk the full length of some of those enormous, long-abandoned runways.

All those things are now just a memory, but I wouldn't swap my battered copy of 'Airfields' for anything......

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"Stand by to pull me out of the seat if I get hit" - Guy Gibson