Prime Minister (The Singular Case of the Time Machine)

In September 1894, the Prime Minister of the United Kingdom was in London to ask Vastra, Jenny Flint, and Strax to protect a time machine at the Academy of Science. Strax mistook him for a woman. (PROSE: The Singular Case of the Time Machine)

Behind the scenes
Although it is not stated in the story, was Prime Minister at the time.