Barely fictional (the Belgian town of Ellezelles proudly displays his birth certificate), this most famous of the "Great Detectives" has a few peculiarities that make him quite distinctive in the UK. What is his favourite drink?
You will find the clue in the following scene from "Double Sin": https://youtu.be/yWYjUH-yA5c
Are you starting to put the clues together? What is Second-Wind Ensemble getting up to?