Lestrade

Inspector Lestrade was a detective of Scotland Yard. He came from the old school that was more concerned with making an arrest than amassing evidence.

Biography
In 1883, he was investigating a series of rooftop burglaries. Sherlock Holmes advised him on the case but neglected to inform Lestrade that he had already worked out that Carolina Lopenski had committed the crimes. (FP: Erasing Sherlock)

In 1885, he unsuccessfully dragged a lake looking for Hatty Doran's body. Dr. John Watson's notes on the case were later written as a story by Arthur Conan Doyle and published in The Strand. In 1887, the Seventh Doctor saw him drinking in the Tank. (NA: All-Consuming Fire)

In 1897, he took credit for the apprehension of Professor Janus. (DWAM: Bat Attack!)

Behind the scenes

 * Inspector Lestrade is best known as a supporting character in Arthur Conan Doyle's Sherlock Holmes stories but also exists as a real person in the Doctor Who universe.
 * Lestrade was normally given credit for solving cases that Holmes actually solved.
 * In-story dating of The Adventure of the Noble Bachelor places the murder of Hatty Doran in 1887 or 1888.