If you can get Black Library's stuff, out of all the 40K books I won (the fantasy stuff was always to grim/dark for my liking) I suggest the Ciaphas Cain series by Sandy Mitchell.
Think of it as a bit like Black Adder, if he was an Imperial Commissar (hell, he even sort of has a Baldrick )
Think of it as a bit like Black Adder, if he was an Imperial Commissar (hell, he even sort of has a Baldrick )