Steven Moffat, in
The Guardian, of Doctor Who:
"Young people watching have to know that they have a place in the future. That really matters. You have to care profoundly what children's shows in particular say about where you're going to be. And we've kind of got to tell a lie: we'll go back into history and there will be black people where, historically, there wouldn't have been, and we won't dwell on that. We'll say, 'To hell with it, this is the imaginary, better version of the world. By believing in it, we'll summon it forth.'"This explains the crowds in The Magician's Apprentice and The Woman Who Lived, which we've recently rewatched; both were as diverse as any scene in modern urban Britain. However, the presence of non-white people in Mediaeval Essex or the Commonwealth of England, and throughout Britain's history, is not a lie; it's just not a well-known
fact. Those recent scenes may exaggerate the numbers, but the new show has long made a point of including some non-white characters in historical European settings.
Here's a few thoughts:
White and Black aren't the only colours; how about mixing it up a bit with more South Asian / Desi actors, more Chinese British actors, more actors with a Middle Eastern background, etc.
How about historical settings outside British / European history?
And historical settings in Britain and Europe in which non-white people were prominent; for example, the 1920s, amongst Chinese immigrants in Liverpool or Black Americans in Paris?
I was impressed by the acknowledgement of Black Britons in Shakespeare's time in The Shakespeare Code, but in her essay for "Doctor Who and Race", Fire Fly pointed out that the issue of race is quickly swept under the carpet. It would be really interesting to see a story which tackles racial issues more directly - not just to tut-tut at the past and by implication congratulate ourselves on being more enlightened, but as plot points in an adventure story: there are places you can't go, people you can't talk to, things you can't do, because of who you are and where and when. This could be done by dropping the Doctor into a setting where white people are unusual and/or unwelcome - such as Japan in the time of the Sakoku Edict. Bonus points for comparing historical racism to modern racism.