What host of Going, Going, Gone became known for "It's a Knockout"?
Going, Going, Gone (TV series):  Originally presented by Andy Craig and assisted by antiques expert Eric Knowles, the final series was hosted by Stuart Hall. Stuart Hall (presenter):  He presented regional news programmes for the BBC in North West England in the 1960s and 1970s, while becoming known nationally for presenting "It's a Knockout" and "Jeux Sans Frontières".
i don't know