Currently reading "Born of the Desert" by Malcolm James Pleydell MD MC (first MO of the newly formed SAS) first published in 1945, reprinted 2001 (which I think is when he passed away?).
Quite possibly the best autobiography I have ever read, and one that has been much quoted in many other books written about the formation of The Regiment.
Clearly a highly intelligent, perceptive and insightful bloke, his style is very contemporary and his reflections on the mindset of the guys are extremely revealing.