Ghostwatch is a British reality-horror/mockumentary television movie, first broadcast on BBC1 on 31 October (Halloween), 1992. Despite having been recorded weeks in advance, the narrative was presented as "live" television. Following its first and only UK television broadcast the show attracted a considerable furore.
Written by Stephen Volk, and directed by Lesley Manning, the drama was produced for the BBC anthology series, Screen One, by Richard Broke, Ruth Baumgarten and Derek Nelson.
As yet, Ghostwatch has only ever been repeated on television outside the UK - on stations such as the Canadian digital channel SCREAM for Halloween 2004, and the Belgian channel Canvas in 2008. Ghostwatch received a huge audience and resulted in an estimated 30,000 calls to the BBC switchboard in a single hour.
(Summary from Wikipedia)