Nathan was one of five Countdown contestants to have appeared on the show's forerunner, Calendar Countdown, broadcast only in the Yorkshire region in 1982. Notably, one of her Calendar games was against Harry Venet, whom she would later face on the national programme.
|#||Date||Type||Contestant 1||Score||Contestant 2||Guest||Lex||Max|
|87||28/09/1983||P||Jackie Nathan||46 – 45||Harry Venet||Ned Sherrin||Yvonne Warburton||71|
|88||29/09/1983||P||Jackie Nathan||47 – 55||Ted Wiles||Ned Sherrin||Yvonne Warburton||81|