In the BBC series Sherlock, Mrs Hudson owns the flat at 221B Baker Street.
Mrs Hudson is Sherlock Holmes and John Watson’s landlady, and the two men rent the upstairs flat from her. She is played by Una Stubbs throughout the series and is based on Mrs Hudson from Arthur Conan Doyle’s Holmes stories.
The character is more than a background landlord in Sherlock. She regularly provides practical support, reacts to the danger surrounding Holmes’s cases and demonstrates that she understands more about violence and criminal life than Sherlock initially assumes.
A common mix-up is to identify Sherlock or John as the owner of 221B. They are tenants, while Mrs Hudson owns the property. The address itself is one of the most recognizable locations in the Holmes tradition.