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Opportunity Knocks was a UK television talent show originally hosted by Hughie Greene.
It was shown on ITV from the 1950s until 1978 and later revived briefly on BBC. Entertainers who appeared included: Mary Hopkin, Bonnie Langford, Les Dawson, Little and Large, Bobby Crush, Peters and Lee, Lena Zavaroni, Frank Carson, Max Boyce and Freddie Starr.