"Mantel said she spent five years researching and writing the book, trying to match her fiction to the historical record.[6] To avoid contradicting history she created a card catalogue, organised alphabetically by character, with each card containing notes indicating where a particular historical figure was on relevant dates. "You really need to know, where is the Duke of Suffolk at the moment? You can't have him in London if he's supposed to be somewhere else," she explained. '
Not sure how having black actors portraying characters fits in with that, kinda contradicts history.