The Stone Tape

• Written by Nigel Kneale at the request of BBC2's Head of Drama Christopher Morahan, The Stone Tape aired on BBC2 (not ITV) on December 25, 1972, as part of the network's 'A Ghost Story for Christmas' strand, drawing an audience of about 2.6 million.
• The play's premise -- that stone can 'record' and replay traumatic events -- is the direct origin of the term 'Stone Tape Theory,' still used in parapsychology circles today, though the underlying idea was floated a decade earlier by archaeologist-turned-parapsychologist T.C. Lethbridge in 1961.
• Unlike a theatrical film, The Stone Tape was shot entirely on videotape, the standard format for BBC television plays of the era, and survives in the BBC archive on its original 625-line PAL colour videotape master.
• Jane Asher, who played programmer Jill Greeley, had genre pedigree going back to childhood -- she'd appeared in Hammer's The Quatermass Xperiment (1955), the film version of Kneale's own Quatermass serial, and later starred opposite Vincent Price in Roger Corman's The Masque of the Red Death (1964).
• Michael Bryant, who played team leader Peter Brock, was a Royal Shakespeare Company mainstay and eight-time Olivier Award nominee -- but he was no TV stranger, racking up film and television credits including A Night to Remember (1958) and The Deadly Affair (1967).
• The play circulated mainly through off-air recordings among fans for decades before the BFI gave it an official DVD release in 2001, featuring commentary from Nigel Kneale and critic Kim Newman.

The entity isn't a ghost at all -- it's a parasite. The 'stone tape' recording is bait. The house feeds on obsession, and Peter's scientific fixation is exactly what it wants. Jill senses this because she's the only team member approaching the phenomenon with dread rather than ambition -- and that sensitivity is exactly what makes her the perfect next recording. The house takes her, not Peter, and lets him walk away to live with what he buried.

Jill is psychic and always has been. The film frames her sensitivity as a glitch, but her visions precede the team's experiments. The house doesn't activate her; she activates the house. Her presence is the catalyst, and Peter's machines are just his way of trying to own a power that was never his to begin with.

The film is a corporate horror story wearing a haunted house suit. Peter treats the supernatural the way his employer treats research teams: as a resource to extract, refine, and monetize. The ghost is a worker who died in service. The house punishes Peter for trying to re-kill her -- record her death permanently, finalize it, own it. The violence is class revenge.

A team of scientists working for an electronics company moves into a renovated Victorian mansion, hoping the old stone walls hide a breakthrough recording medium. Instead they find a haunting: the ghostly apparition of Louisa, a servant girl who fell to her death on a now-hidden staircase back in the 1890s. Team leader Peter Brock becomes obsessed with proving the stones themselves "recorded" her death, while programmer Jill Greeley is the one who feels the phenomenon most intensely. Their experiments burn through the Louisa recording and erase it — uncovering something far older and more hostile buried beneath it. When Jill goes back to the room alone, the ancient presence drives her to her death on those same stairs, and the stone lays down a new, crystal-clear recording: Jill screaming Brock's name as she dies. Rather than face what he unleashed, Brock discredits her at the inquest and has her research destroyed.