Season
- Season 1 1956-06-13
- Season 2 1964-07-04
- Season 3 1965-07-03
- Season 4 1966-07-02
- Season 5 1967-04-29
- Season 6 1968-03-16
- Season 7 1968-08-21
- Season 8 1968-12-25
- Season 9 1969-09-08
- Season 10 1970-06-15
- Season 11 1971-03-15
- Season 12 1971-11-08
- Season 13 1972-08-07
- Season 14 1973-08-06
- Season 15 1974-08-05
- Season 16 1975-09-29
- Season 17 1976-10-04
- Season 18 1977-09-19
- Season 19 1987-03-21
- Season 20 1988-03-05
- Season 21 1989-03-04
- Season 22 1990-03-31
Opportunity Knocks - Season 21
0.00 30 minutes 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.
