Interesting. I wasn't aware of any camp elements in The Man from UNCLE -- at the time, it was the most popular US Bond imitation of the spy craze. I have to wonder how much of these judgements are in retrospect; Star Trek was seen by some at the time as incorporating some campy elements, and later as a whole by many, but Roddenberry didn't intend it that way.
The Avengers is another matter, though I'd consider it more parody than "camp", many episodes being directed parodies of various genres or films and TV shows, both British and American -- including Batman!