The Man Who Haunted Himself(1970)

Directed by Basil Dearden. With Roger Moore, Hildegard Neil, Alastair Mackenzie, Hugh Mackenzie. Harold Pelham encounters a duplicate of Himself .
Whilst driving his Rover P5, uptight City worker Harold Pelham appears to become possessed and he has a serious accident at high speed. On the operating table, he briefly suffers clinical death, after which there appear to be two heartbeats on the monitor. When he awakes, Pelham finds his life has been turned upside-down: in his job as a director of a marine technology company he learns that he now supports a merger that he once opposed, and that he apparently is having an affair. Friends, colleagues and acquaintances claim to have seen him in places where he has never been, and Pelham starts being followed by a mysterious silver car (a Lambamborghini islero ). Does Pelham have a Doppelganger - or is he actually going insane?