
A radio, and later television, talent show originally hosted by Hughie Green, with a late-1980s revival hosted by Bob Monkhouse, and later by previous winner Les Dawson.

Associated Rediffusion Hosted by Hughie Green until 1978
ATV London
Season 3 of Opportunity Knocks premiered on 1965-07-03.
Season 4 of Opportunity Knocks premiered on 1966-07-02.
Season 5 of Opportunity Knocks premiered on 1967-04-29.
Season 6 of Opportunity Knocks premiered on 1968-03-16.
Thames Television
Season 8 of Opportunity Knocks premiered on 1968-12-25.
Season 9 of Opportunity Knocks premiered on 1969-09-08.
Season 10 of Opportunity Knocks premiered on 1970-06-15.
Season 11 of Opportunity Knocks premiered on 1971-03-15.
Season 12 of Opportunity Knocks premiered on 1971-11-08.
Season 13 of Opportunity Knocks premiered on 1972-08-07.
Season 14 of Opportunity Knocks premiered on 1973-08-06.
Season 15 of Opportunity Knocks premiered on 1974-08-05.
Season 16 of Opportunity Knocks premiered on 1975-09-29.
Season 17 of Opportunity Knocks premiered on 1976-10-04.
Season 18 of Opportunity Knocks premiered on 1977-09-19.
BBC - 21 March 1987 - 20 June 1987 Hosted by Bob Monkhouse
5 March 1988 - 4 June 1988
4 March 1989 - 3 June 1989
Hosted by Les Dawson
Made with Love By Anonymous
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