an Entity references as follows:
Opportunity Knocks is a British television and radio talent show originally hosted by Hughie Green, with a late-1980s revival hosted by Bob Monkhouse, and later by previous winner Les Dawson. From its origin on BBC Radio in 1949 the show provided a platform to fame for acts such as Spike Milligan and Frankie Vaughan. One of the most popular shows on British television, in the 1960s and 1970s it had a weekly audience of 20 million viewers.