Lost Soul was a Muggle play. The Regency Playhouse promoted this play with ads on double-decker buses in London in 1993 and 1997, suggesting that it either had a four-year run at the theatre, or was produced on two separate occasions.
- Harry Potter and the Prisoner of Azkaban (film) (Mentioned on a bus ad)
- Harry Potter and the Deathly Hallows: Part 1 (Mentioned on a bus ad)
- Harry Potter Limited Edition (Mentioned on a bus ad)