The "Maids of Honor" tea shop where the detectives meet with Oona Pearce is actually called "The Original Maids of Honor", founded in 1850, and is located on Kew Road, where it has been since 1860.
Usually, Dennis Waterman's theme song plays during both the opening and closing credits of each episode. However, this episode ends on a rare serious note and the theme song is not played over the closing credits.