Chesham Park was used for the scene where Natalie meets the jogger, played by a then unknown Pierce Brosnan, and credited as ‘Last Victim’.
The operating theatre and morgue scenes were shot in Chesham Cottage Hospital (now derelict). Thank you to Moyb Ullah for informing me of this location. He discovered it in a call sheet for the episode. It was at the top of Hospital Hill.
The Silent Scream
The infamous pet shop run by Peter Cushing is located on Broad Street, just down from the High Street.