Robert Kee - A Crowd Is Not Company.
A good account of life as an RAF PoW.
It must be remembered that, as an RAF Pilot, he was an Officer, and therefore a prisoner "belonging" to the Luftwaffe, not the German Army.
This highlights, quite well, some of the "comradeship" of fellow soldiers as opposed to the enmity of "Tommies and Krauts", the kind of kinship that the general public on both sides wouldn't necessarily understand or condone.
Look for the steak episode...
(there will be more recommended books coming along, some classics on the subject, some little known..)