DUMB EDWARDIANS?Do I object to 'dumbing-down' in arts broadcasting? I don't know ... broadcasters' interest in all things Victorian has now trickled down to the Edwardian era in BBC4's forthcoming season of very loosely connected programmes. The good news is a new adaptation of The Diary of a Nobody (yes, people have already pointed out its not Edwardian). The bad news includes titles such as Edwardian SuperSize Me. Hopefully better than it sounds.