The original version of the show was broadcast on BBC Two from 20 February 1998 to 23 February 2001, on BBC Choice from 8 October 2001 to 7 February 2003 (later repeated on BBC Two) and on Channel 5 from 2 November 2003 to 28 March 2004. A revival was broadcast on BBC Two from 24 July 2016 to 7 January 2018. To date, the show has been broadcast as 10 main series each centred around a single competition, two "Extreme" series with several unconnected events and several special episodes.