Around Aberdeen: Cluny's Port

When I was a kid, I read three or four of Brian Jacques' Redwall series. In the first book, the villain is an evil rat named Cluny the Scourge, who wears a patch on his eye and has a poisoned barb on his tail. He is, of course, soundly defeated in the book's climax. On St. Machar Drive, on the University of Aberdeen Campus, there's a door into what I think must be a private residence, and above the door it reads "Cluny's Port". I never had an opportunity to investigate any further, but I made a point of taking a picture.