Is James Bond explicitly described as white in Ian Fleming's books?

Is his ethnicity ever specified in the books beyond "Scottish" (which I believe was added after Sean Connery's portrayal)?

I ask because there is currently some controversy on the subject since a minor celebrity has stated that Idris Elba would not be a good Bond because Bond is "white".

Is this backed by the books? If so, did mention of Bond's skin color predate the movies?