Analysis of information sources in references of the Wikipedia article "Miss Scarlet and The Duke" in English language version.
New Chapter Begins with Kate Phillips Returning; Series Bids Farewell to "The Duke"
...Eliza, to see what that is like without Duke, to kind of allow her to be not held back by Duke." "(Stuart) felt that he'd taken the character as far as he could go, and that this would be the natural point for Duke to leave.