The police station used for the exterior shots is the old Bow Street magistrates court in London.
The hidden word in the closing credits is MISPER, as in "missing person."
Between the second and third seasons, DS (Detective Sergeant) Sunil "Sunny" Khan has been promoted to DI (Detective Inspector), and he is introduced with his new title starting with this episode.
Sara Stewart (Mel Hollis) & Georgia Mackenzie (Dr. Balcombe) also appeared in two episodes of Waking the Dead (2000) as Claire Yardley & DS Andy Stephenson respectively.