Just published 'Great War to Great Escape - the Two Wars of Flight Lieutenant Bernard 'Pop' Green MC'. Bernard served in France during WWI, then as an air gunner in WW2, was shot down, became a POW and took part in the Great Escape - fortunate not to be one of the 50 that were shot.
Full details of the book are on
http://www.fightinghigh.com/GreatWartoGreatEscape.htm