I have watched all three parts of the Lucy Worsley Agatha Christie "Mystery Queen" series on PBS.
I have enjoyed it, for the most part, although it covered details I already knew about Christie.
That said, I took great exception to a segment in part 3: Worsley discusses the novel "And Then There Were None". She then went into the controversy over the play title for the same story. That play begins "Ten Little..." but the original third word was the "N" word. Worsley goes into detail about how horrible a word it was as a reference to black people in the U.S. She then says that when the "N" word was changed, in the U.S. version, to "Indians", that was just as bad a slur toward Native Americans.
The thing is, she didn't really tell the "whole truth": The "N" word is how the British colonialists referenced the natives of India. That was the original reference for the play. When the title was changed, it was "corrected" to refer to the natives of India. Neither word referenced anything in "the colonies", although both were, or would become, offensive here.
A British program about a British author by a British historian, but they just couldn't state factual information on this matter.