description Opportunity Knocks Overview
Opportunity Knocks was a British radio and television talent show created and hosted for many years by Hughie Green. It began on radio in 1949, reached television on the ITV network in 1956, and later appeared in BBC television versions. The programme presented amateur singers and other acts before a studio audience, whose response was represented by the associated Clapometer, an audience-reaction indicator used during the television run ([National Science and Media Museum](https://www.scienceandmediamuseum.org.uk/objects-and-stories/opportunity-knocks-clapometer-television-technology)).
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