Priest won his first game on 24 March 2008 with a century against Tony Durrant. Priest followed this with five more wins, including a run of three centuries on the trot, before losing his seventh game to Nigel Davies. However, Priest's 6 wins and 697 points were enough to secure a place in the finals as No. 6 seed.
Priest took on No. 3-ranked Tim Reypert in the third quarter-final. Priest came out the winner with ease, winning by 37 points. In the semi-final, Priest beat Peter Davies 100 – 70 in a game that was notable because Carol allowed 6 − 3 = 2 in the final numbers game. In the grand final, Priest had to take on the No. 1 prospect David O'Donnell, and went 13 – 0 down after two rounds, and never recovered. He did beat the No. 1 seed with MIRADOR but it wasn't enough to win the game, ultimately losing by 30 points.
Priest returned for the Championship of Champions XIII, but lost to Kai Laddiman on a crucial conundrum in the first round. Priest buzzed in with CAFETERIA which was wrong, only to realise a few seconds later that the answer was CAFETIERE. However it was too late, and he lost by 8 points.
Priest continues to play Countdown, and compete in unofficial tournaments, including CoNot 2008, CoLei 2008, COLIN 2009, CoNot 2009, CoLei2, COLIN 2010, Co:Lon 2010, CoLei3, COLIN 2011, CoLei4, CoNot 2011, Co:Lon 2011, CoChest, COLIN 2012, CoLei5, COHUD and CoChest2. In 2010, he won the CoLei Summer Special.
Priest returned to the Countdown community on 11 March 2021, participating in Series 3 of ZoomDown.
|#||Date||Type||Contestant 1||Score||Contestant 2||Guest||Lex||Max|
|4563||24/03/2008||P||Tony Durrant||87 – 110||Richard Priest||Ann Widdecombe||Susie Dent||131|
|4564||25/03/2008||P||Richard Priest||91 – 75||Gill Ford||Ann Widdecombe||Susie Dent||130|
|4565||26/03/2008||P||Richard Priest||109 – 59||Angus McGregor||Ann Widdecombe||Susie Dent||135|
|4566||27/03/2008||P||Richard Priest||105 – 60||Sandra Gray||Ann Widdecombe||Susie Dent||118|
|4567||28/03/2008||P||Richard Priest||101 – 25||Matt Wate||Ann Widdecombe||Susie Dent||123|
|4568||31/03/2008||P||Richard Priest||98 – 20||Richard Wilson||Lynda Baron||Susie Dent||120|
|4569||1/04/2008||P||Richard Priest||83 – 85||Nigel Davies||Lynda Baron||Susie Dent||120|
|4623||16/06/2008||QF||Tim Reypert||53 – 90||Richard Priest||Dr Phil Hammond||Susie Dent||116|
|4626||19/06/2008||SF||Richard Priest||100 – 70||Peter Davies||Dr Phil Hammond||Susie Dent||124|
|4627||20/06/2008||GF||David O'Donnell||91 – 61||Richard Priest||Dr Phil Hammond||Susie Dent||118|
|4736||15/01/2009||CP||Kai Laddiman||93 – 85||Richard Priest||Andrew Sachs||Susie Dent||117|