Prime Minister (The Singular Case of the Time Machine)

A Prime Minister, also known as the Earl of Rosebery, was in London in September 1894 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.