A computer programmer from Leicester, he made his debut on 14 April 1987, beating Keith Albans 83 – 45, setting a record score that would remain unequalled for nine years and ultimately unbeaten following Countdown changing formats to the 15 round game. The show would go on to be repeated on more than one occasion over the years. Balment won two more heats before eventually succumbing to Mike Tobias, but would return for the quarter-finals as #4 seed. There, he defeated Nigel Aspden and Jon Marsh on his way to the final against Janet McRae, and saw off McRae's challenge to emerge the 81 – 66 winner and the champion of the twelfth series of Countdown.
Balment is also an active player on the British Scrabble circuit, where he is known as the 'Yo-Yo' because of his wildly fluctuating rating.
|#||Date||Type||Contestant 1||Score||Contestant 2||Guest||Lex||Max|
|546||14/04/1987||P||Stephen Balment||83 – 45||Keith Albans||Gyles Brandreth||Catherine Clarke||85|
|547||15/04/1987||P||Stephen Balment||53 – 46||Jez Gill||Gyles Brandreth||Catherine Clarke||68|
|548||16/04/1987||P||Stephen Balment||53 – 45||Helen Pitt||Gyles Brandreth||Catherine Clarke||75|
|549||17/04/1987||P||Stephen Balment||43 – 59||Mike Tobias||Anne Robinson||Della Thompson||71|
|591||16/06/1987||QF||Stephen Balment||73* – 63||Nigel Aspden||Patrick Mower||Julia Swannell||95|
|592||17/06/1987||SF||Stephen Balment||51 – 30||Jon Marsh||Patrick Mower||Julia Swannell||70|
|594||19/06/1987||GF||Stephen Balment||81 – 66||Janet McRae||Diane Solomon,|
|596||23/06/1987||CQF||Darryl Francis||46 – 28||Stephen Balment||Sally James||Della Thompson||73|
|M18||31/07/1989–4/08/1989||M||David Poulter||57 – 105||Stephen Balment||none||Catherine Clarke||??|
|M70||30/07/1990–3/08/1990||M||Michael Wylie||118 – 44||Stephen Balment||none||Simon Mason||134|
|1875||6/11/1996||dQF||Stephen Balment||52 – 44||Gino Corr||Geoffrey Durham||Susie Dent||72|
|1878||11/11/1996||dSF||Stephen Balment||48 – 57||Joyce Cansfield||Barry Cryer||Susie Dent||71|