My new reading material has arrived. 

It’s a second edition, from 1955, the year the book was released, 20 years after the author’s death. 

It was actually written in the 20s, but wasn’t published in his lifetime, or for a couple of decades later, since it didn’t reflect well on the RAF. 

I’ve only skimmed a few pages, but it’s very well written, with an unusual style.