Isabelle Heward was a finalist in Series 28.
Prior to appearing on Countdown, she was a finalist on the now-defunct Film Buff of the Year and has since appeared on Mastermind, in which she became champion in 2017. She then reached the grand final of Fifteen to One in June 2017. Heward also participated on the Scunthorpe Scholars team in Series 12 of Only Connect in 2016.
|#||Date||Type||Contestant 1||Score||Contestant 2||Guest||Lex||Max|
|1572||9/09/1994||P||Dave Ledger||39 – 49||Isabelle Heward||Richard Stilgoe||Ruth Killick||74|
|1573||12/09/1994||P||Paul Henderson||50 – 54||Isabelle Heward||Richard Stilgoe||Ruth Killick||72|
|1574||13/09/1994||P||Bryan Montgomery||54 – 55||Isabelle Heward||Philip Franks||Ruth Killick||72|
|1575||14/09/1994||P||Hannah White||47 – 50||Isabelle Heward||Philip Franks||Ruth Killick||74|
|1576||15/09/1994||P||Warwick Bassett||29 – 47||Isabelle Heward||Philip Franks||Ruth Killick||73|
|1577||16/09/1994||P||Stewart Ivins||17 – 58||Isabelle Heward||Philip Franks||Ruth Killick||70|
|1578||19/09/1994||P||Carole Rison||59 – 40||Isabelle Heward||Philip Franks||Ruth Killick||71|
|1583||26/09/1994||QF||Wayne Kelly||59 – 46||Isabelle Heward||Michael Parkinson||Richard Samson||73|