In The Changes, a mysterious force causes people to run amok, smashing all technology. The heroine, Nicky, gets left behind when her parents flee, and she has to somehow find the cause of the changes. I watched through my fingers.
However, I'm delighted to learn that the BFI are finally putting to rest the conspiracy theories, that the programme was simply too frightening to be shown again, and are releasing The Changes on DVD.
For after nearly forty years, I might just find closure.