Or even just one genre. "Now dear, you've been bingeing on horror far too long. Go and eat your greens. Look, there's a nice pile of gardening books over there."

The BBC "thing" is limited to fiction only. Its nomination form is tedious, skewed, and ripe to be broken. I'm tempted to nominate the Bible just to see how it copes. Well, if it's not fiction, surely it counts at least as a novelisation.