Aston led group one but his time was eclipsed by Jupp who became the first Cadet to lap Ellough Park in under 50-seconds with a lap of 49.99-seconds to secure overall pole.
Jupp won heat one, heading home Macdonald with Aston third and Rawson fourth. Aston won heat two in Jupp's absence to keep the pressure on despite pressure from Cuff and Lando Norris. Harvey was penalised for driving out of bounds at turn three, relegating him to tenth.
Heat three was all about Jupp again as he led every lap to win from Rawson with Nelson third and Macdonald fourth. That win meant that Jupp would start the final from pole needing Aston to finish fourth or lower. Harvey could still win the title but he needed to win with Jupp and Aston, who started second, out of the top ten.
Harvey's chances became almost academic at the first corner when Nelson spun to the inside, coming across the track in front of the field and allowing Jupp and Aston to break clear. Everyone else except eleventh place starter Ross Gunn was delayed.
The top three circulated as one with Jupp ahead and Gunn passing Aston, who remained in overall control. In the closing stages Jupp desperately tried to slow the pace to bring the chasing pack into play but after 19 dramatic laps Aston crossed the line in third, two tenths ahead of fourth place man Callum Ilott to end the season tied on points with Jupp but champion courtesy of a higher overall total before dropped scores.
Jupp put a brave smile on the result while Gunn was over the moon with second. Harvey was sixth, behind leading independent runner Rawson and finished the year third overall.