Other second hand books worth searching would be 'Bloody April' and I second the motion for 'Goshawk Squadron' et al from DR.
The collected Donald Jack books are called 'The Bandy Papers' and extend well beyond the three volumes mentioned. Those first three books are the only things that have ever reduced me into that nutter opposite you on the bus, plane, tube laughing out loud as they read.
I used to compare it to Flashman - very funny story set in well researched historical context which gets bent slightly where needed to suit the plot.
For the young'uns think Series 4 Blackadder although I'm horrified to work out it's just coming up to 19 years since that was first transmitted
Absolute thumbs up for the Bandy Papers - Amazon, Abe and the usual suspects will supply some real fun for WW1 aviation fans. The first 3 volumes are very good. Our search engine will pull up similar threads from the past.
Rob - another horse faced Canadian