Sirs, Madames,
Best example, most successful in literary terms anyway, was the book spinoff of the classic BBC series back in the early 80s, Yes, Minister. Great series about Jim Hacker, a likeable but dense pol who is knocked around like a ping pong ball by a civil servant, Sir Humphrey Appelby, who supposedly works for him. The books based on the series (and its later incarnation, Yes, Prime Minister, in which a slightly more experiened Hacker gets a measure of revenge) were the working diaries of one of the more sympathetic civil servants, Bernard Wooley. Hysterical series and rewarding books.
http://en.wikipedia.org/wiki/Yes_Minister
YHS, etc