This has stuck with me for so long that it's almost impossible to believe it ever existed! A short film I saw as part of a double feature in Scotland at the local cinema (maybe with When a Stranger Calls?) -late '70s/early '80s. The parts that stick most is that it is British, short and it's about a woman who repeatedly "sees" or remembers a murder being committed, no one believes her and she is hospitalized. In the very end of the film it turns out to be a premonition of the murder of her own family by a psycho hiding in the back of the car. The film ends with her seeing a hand with a knife come up from the back seat as she stands horrified... Help me remember what this film was!

Thanks!