Patsy (The Talons of Weng-Chiang)

The ghoul was a woman in Victorian London who found the body of Buller floating in the Thames. She brought it to the attention of the Metropolitan Police. She rather enjoyed the gruesome sight.

Behind the scenes
This character is not a "ghoul" in the sense of "an evil spirit or phantom that eat corpses", but in the sense of "a person morbidly interested in death or disaster". (Oxford Dictionary Online)

Actress Patsy Smart removed her false teeth to play this part, handing them in a handkerchief to director David Maloney. (DCOM: The Talons of Weng-Chiang)