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Kiern Tyler Jewiss (born 3 July 2002) is a British people racing driver who is currently competing in the 2025 British GT Championship for 2 Seas Motorsport. He is the winner of the 2018 F4 British Championship and the 2022 Porsche Carrera Cup Great Britain. In 2025, he won the British GT Championship alongside Charles Dawson.
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In 2016 he stepped up to the OKJ for his only international year in karting, which was also his final full-time before making his car racing debut. He started the season with winning the WSK Champions Cup with Riccardo Kart Racing, Jewiss also competed in the WSK Super Master Series and the WSK Final Cup, but came 18th in the former and 6th in the latter.
He also made his debut in the CIK-FIA European Championship, where he finished 10th in the overall standings, and then the CIK-FIA World Championship, where finished in 7th.
To round off the year, he competed in the Super One Series and finished the championship in 9th.
2017 was his last competitive outing in karts, where he made his OK debut, at the 22° South Garda Winter Cup for Forza Racing where he came in 17th.
He finished runner-up to the end of the season Ginetta Junior Winter Series, with two wins, three pole positions, one fastest lap, three podiums and 120 points amongst the four races.
After a win heavy first half of the season, the latter half was less successful as he only took one win but maintained a consistent enough points streak to win the title in his rookie Formula 4 year and his 71 points margin was the biggest gap of the championship winner and the championships runner-up until 2024, when Deagen Fairclough won the championship with a 222.5 points margin.
He collected six wins, two pole positions, seven fastest laps and eighteen podiums throughout the thirty races in the series. Jewiss was also a finalist of the 2018 McLaren Autosport BRDC Award.
The first half of his championship had consistent points finishes, but he only managed to get two third places – at Snetterton Circuit and Donington Park – while the final half of the season was more successful, getting back-to-back podiums at the third race of Circuit de Spa-Francorchamps and the first race of Brands Hatch. Not long after, his first Formula 3 win at the third rounds of Brands Hatch, where he got another back-to-back podium and first pole position at the first race at Silverstone Circuit, where he came second.
He also got another second place and pole position at the third race of the Silverstone round. The final round of the series at Donington Park also followed a similar pattern, where he came second in the first and third races. Jewiss finished the championship 4th in the standings with one win, two pole positions, two fastest laps, nine podiums and 438 points.
Jewiss got his first podium in the series in his debut race at Brands Hatch with a second place, after two fourth places, he got his maiden win at the second race of the second round at Snetterton Circuit.
At Oulton Park, he came fifth in the first race and got his first pole position in the series at the second race, where he would convert it to his second win of the year. Knockhill proved to be difficult as he got his only retirement of the year at the second race. Jewiss claimed his third win at the second race of Croft Circuit and came third in the next race at Silverstone Circuit, getting his first back-to-back podiums.
In the penultimate round at Donington Park, he got his only double podium, with a third place in the first race and a final win to add to his tally in the second race. He came fifth and fourth in the final round at Brands Hatch, and finished 3rd in the overall standings with four wins, one pole position, seven podiums and 104 points.
The first round at Donington Park didn't go as expected, coming fourteenth in the first race but getting a podium in the second round, salvaging the last races poor performance. What followed was a podium streak – including a win at Brands Hatch – lasting for six races.
At the next round at Snetterton Circuit, he converted a pole position to a win, and after two podiumless races, he would win four races in a row, which were the final races of the championship. He won the championship ahead of Adam Smalley with six wins, four pole positions, seven fastest laps, eleven podiums and 141 points.
He only managed two points finishes, and didn't enter the final round of the championship at Circuit de Barcelona-Catalunya. Jewiss ended the championship in 35th with two points in the Bronze classification.
| Bayford Meadows Winter Series - Honda Cadet | 1st | |
| Lydd Winter Championship - Honda Cadet | Ktj Racing | 1st |
| Buckmore Park Winter Championship - Honda Cadet | 1st | |
| Super One Series - Honda Cadet | 11th | |
| Henry Surtees Commemorative Meeting - Honda Cadet | Ktj Racing | 1st |
| Kartmasters British GP - Honda Cadet | 2nd | |
| ABkC 'O' Plate - Honda Cadet | 3rd | |
| Formula Kart Stars - Honda Cadet | 1st | |
| Super One Series - Honda Cadet | 3rd | |
| Super One Series - Honda Cadet | Next-Gen Motorsport | 1st |
| Super One Series - IAME Cadet | 5th | |
| Kartmasters British GP - IAME Cadet | 16th | |
| Kartmasters British GP - Honda Cadet | 3rd | |
| Super One Series - Honda Cadet | 2nd | |
| Kartmasters British GP - IAME Cadet | 1st | |
| Kartmasters British GP - Honda Cadet | 2nd | |
| Super One Series - IAME Cadet | AIM Motorsport | 2nd |
| Rotax Max Euro Trophy - Junior Max | Strawberry Racing | 9th |
| Super One Series - Mini Max | 1st | |
| Rotax Max Wintercup - Junior Max | 8th | |
| WSK Super Master Series - OK Junior | 18th | |
| CIK-FIA European Championship — OKJ | 10th | |
| CIK-FIA World Championship — OKJ | Forza Racing | 7th |
| WSK Final Cup - OK Junior | 6th | |
| Super One Series - OK Junior | 9th | |
| Ginetta Junior Winter Series | 4 | 2 | 3 | 1 | 3 | 120 | 2nd | |
| GT World Challenge Europe Endurance Cup - Bronze Cup | 4 | 0 | 0 | 0 | 0 | 2 | 35th | |
| GT World Challenge Europe Endurance Cup | Steller Motorsport | 1 | 0 | 0 | 0 | 0 | 0 | NC* |
| 2 Seas Motorsport | ||||||||
| GT World Challenge Europe Endurance Cup - Silver Cup | Steller Motorsport | 1 | 0 | 0 | 0 | 1 | 24 | 2nd* |
* Season in progress
| 2017 !nowrap | Douglas Motorsport | Brands Hatch | Brands Hatch | Donington Park | Donington Park | Donington Park | Thruxton Circuit | Thruxton Circuit | Oulton Park | Oulton Park | Croft Circuit | Croft Circuit | Croft Circuit | SNE 1 | SNE 2 | SNE 3 | KNO 1 | KNO 2 | ROC 1 | ROC 2 | ROC 3 | SIL 1 | SIL 2 | SIL 3 | Brands Hatch | Brands Hatch | Brands Hatch ! 4th ! 542 |
| 2018 !nowrap | Double R Racing | Brands Hatch | Brands Hatch | Brands Hatch | Donington Park | Donington Park | Donington Park | Thruxton Circuit | Thruxton Circuit | Thruxton Circuit | Oulton Park | Oulton Park | Oulton Park | Croft Circuit | Croft Circuit | Croft Circuit | SNE 1 | SNE 2 | SNE 3 | ROC 1 | ROC 2 | ROC 3 | KNO 1 | KNO 2 | KNO 3 | SIL 1 | SIL 2 | SIL 3 | Brands Hatch | Brands Hatch | Brands Hatch ! style="background:#FFFFBF" | 1st ! style="background:#FFFFBF" | 445 |
| 2019 ! nowrap | Douglas Motorsport | Oulton Park | Oulton Park | Oulton Park | SNE 1 | SNE 2 | SNE 3 | SIL1 1 | SIL1 2 | SIL1 3 | Donington Park | Donington Park | Donington Park | SPA 1 | SPA 2 | SPA 3 | Brands Hatch | Brands Hatch | Brands Hatch | SIL2 1 | SIL2 2 | SIL2 3 | Donington Park | Donington Park | Donington Park ! 4th ! 438 |
| 2020 ! nowrap | Douglas Motorsport | OUL 1 | OUL 2 | OUL 3 | OUL 4 | Donington Park | Donington Park | Donington Park | Brands Hatch | Brands Hatch | Brands Hatch | Brands Hatch | Donington Park | Donington Park | Donington Park | SNE 1 | SNE 2 | SNE 3 | SNE 4 | Donington Park | Donington Park | Donington Park | SIL 1 | SIL 2 | SIL 3 ! 13th ! 211 |
| 2021 ! nowrap | Team Parker Racing | Brands Hatch | Brands Hatch | SNE 1 | SNE 2 | Oulton Park | Oulton Park | KNO 1 | KNO 2 | Croft Circuit | Croft Circuit | SIL 1 | SIL 2 | Donington Park | Donington Park | Brands Hatch | Brands Hatch ! style="background:#FFDF9F" | 3rd ! style="background:#FFDF9F" | 104 |
| 2022 ! nowrap | Team Parker Racing | Donington Park | Donington Park | Brands Hatch | Brands Hatch | Oulton Park | Oulton Park | Knockhill | Knockhill | SNE 1 | SNE 2 | Thruxton Circuit | Thruxton Circuit | SIL 1 | SIL 2 | Brands Hatch | Brands Hatch | 1st | 141 |
| 2023 !nowrap | Team Parker Racing !nowrap | Porsche 911 GT3 R (992) ! Bronze | Monza Circuit | LEC | SPA 6H | SPA 12H | SPA 24H | NÜR | CAT ! 35th ! 2 |
| 2025 ! nowrap | 2 Seas Motorsport ! nowrap | Mercedes-AMG GT ! GT3 | Donington Park | SIL 1 | Oulton Park | Oulton Park | SPA 1 | SNE 1 | SNE 2 | Brands Hatch | Donington Park !style="background:#FFFFBF;" | 1st !style="background:#FFFFBF;" | 173.5 |
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