Team RAC (2007)

Onslow-Cole began his career in karting at the age of eight.^[1] He was the 2006 Renault Clio Cup champion, winning the title by 113 points from his nearest rival. This allowed him to graduate to the BTCC for the 2007 season. He finished 10th overall in the championship standings for West Surrey Racing after recording four podiums, including his maiden victory at Snetterton.

VX Racing (2008)

In 2008, Vauxhall acquired his services and placed him into the third Vectra along with previous champions of the series, Fabrizio Giovanardi (2007) and Matt Neal (2005 & 2006). He took pole position for round 3 at Donington Park, leading race 1 until dropping to third through an off-track excursion. He was also strong in race 3, before being hit by Giovanardi, but recovered to finish third. He recorded another pole at Thruxton and followed this up with his first two wins of the season in races 1 and 2. He would go on to finish a career best sixth in the championship, scoring 170 points with two wins and nine podiums, including five podiums in succession.

Team Aon (2009–2011)

Onslow-Cole driving the Team Aon Ford Focus ST at Brands Hatch during the 2010 British Touring Car Championship season.

Having been replaced at VX Racing by Andrew Jordan, he started 2009 without a drive. Onslow-Cole drove the medical car during the second BTCC meeting of the season, at Thruxton.^[2]

Onslow-Cole was brought in by Team Aon to replace Alan Morrison ahead of the round at Croft, where he was due to drive the medical car once again. He had to use Morrison's race suit and seat.^[3] He rejoined the team later in the season for the final three rounds, before signing for the team full-time for 2010.

In 2010 Team Aon's Fords are powered by liquefied petroleum gas, and Onslow-Cole was confident of a title push pre-season^[4] and the team claimed four of the season's first five pole positions. His first win of the season was awarded to him after Chilton was excluded from the results at Brands Hatch due to a technical infringement; holding off Gordon Shedden by 0.009 seconds, the closest finish in BTCC history.^[5] By midseason, other teams and drivers were complaining about their apparent straightline speed advantage.^[6] Onslow-Cole scored stronger results than team-mate Tom Chilton early in the season, but in the first two races at Silverstone, Onslow-Cole moved over when leading to allow Chilton to take the victories.^[7] Chilton's father is responsible for the team's sponsorship from Aon Corporation, but Onslow-Cole was able to win the third race.

In 2011, Onslow-Cole raced a NGTC-powered, Super 2000-specification Volkswagen Golf in the British Touring Car Championship, with AmD Milltek Racing.^[8] It was announced on ITV4's live coverage on 5 June 2011 that he had parted company with the team, after the second race at Oulton Park. Onslow-Cole has returned to Team Aon to drive the third 'Global' Ford Focus alongside 2010 team-mate Chilton and Andy Neate.

eBay Motors (2012)

With Team Aon having left to go to the World Touring Car Championship, Onslow-Cole had to look elsewhere for a drive in 2012.^[9] In February 2012 it was announced that he would join eBay Motors, the team for which under a different guise he made his BTCC debut with in 2007.^[10] He finished on the podium for his first race back with the team at Brands Hatch. He went on to claim a further 6 Podiums leading him to 6th in the Drivers Standings.

Team HARD. (2013)

Onslow-Cole driving the Team HARD Volkswagen CC at Oulton Park during the 2013 British Touring Car Championship season.

In January 2013 it was confirmed that Onslow-Cole would drive an NGTC Volkswagen CC for Team HARD. in the 2013 season in a three-year deal.^[11] He took his first podium for the team at Thruxton where he finished third in race one and then he finished second in race two, his best result of the season.^[12] He decided to miss the final three rounds of the season. at this stage he was placed 10th in the Championship.

Motorbase Performance (2013)

In September 2013, Onslow-Cole joined Motorbase Performance under their Airwaves Racing banner for the final three rounds of the 2013 season in a bid to improve the team's points tally in the constructors Standings. He achieved a best result of 4th and finished the year 12th in the Drivers Standings.

Strata21 (2014)

In April 2014 it was announced that Onslow-Cole would switch from touring cars to GTs, partnering Paul White in the 2014 British GT Championship for the Strata21 team, initially in a Nissan GT-R Nismo GT3^[13] before switching to an Aston Martin Vantage GT3. The pairing managed to finish every round of the championship^[14] and scored their first podium finish in the series when they finished third in the second race at the championship's Snetterton meeting.^[15]

Ram Racing (2015)

Onslow-Cole remained in GTs for 2015, joining Ram Racing to race a Mercedes-Benz SLS AMG GT3 in the 24H Series, and taking second places at the Dubai 24 Hours and the 12 Hours of Mugello^[16] before scoring his first win in the series at the 24 Hours of Paul Ricard. Ram Racing won their overall class and Onslow-Cole won his maiden GT championship. Outside of GT racing Onslow-Cole won the MSA RX Talent Search at Lydden Hill in May 2015, securing a drive in the RX Lites support race at the World RX of Turkey at Istanbul Park in October 2015.^[17] He went on finish in third place overall in his rallycross debut and hopes to contest more rounds with the support of sponsor Rockstar Energy Drink. Also in 2015 he won the Aston Martin festival at Le Mans.

Bentley Team Parker Racing (2016)

For 2016 Onslow-Cole signed for Team Parker Racing racing a Bentley Continental GT3 competing in the Blaincpain Endurance Championship for selected rounds. He also had various outings in the 24H Series once more. On 16 October 2016 he won the 24H race of Brno racing a Ferrari 488 GT3 for Scuduri Praha. He also made a one off appearance in the VLN Endurance Championship at the Nurburgring racing a Toyota GT 86 CS Cup-Car for Team TMG. He qualified 4th and finished the race 3rd in class.

BMW Motorsport (2017)

In 2017, Onslow-Cole will make his debut as a BMW factory driver when he takes on Nürburgring 24 Hours in the M6 GT3. He will prepare for the event by contesting VLN1, VLN2 and the qualifying race with the team. He will also contest the Le Mans Cup with RAM Racing and GT Open with sps automotive performance, both in the Mercedes AMG GT3.

Complete International GT Open results

Pos.	Team	Teammate	Class	1	2	3	4	5	6	7	8	9	10	11	12	13	14	Pos	Points
2018	SPS Automotive Performance	Valentin Pierburg	Pro-Am	EST 1 1	EST 2 6	LEC 1 1	LEC 2 Ret	SPA 1 1	SPA 2 3	HUN 1 1	HUN 2 10	SIL 1 11	SIL 2 1	MNZ 1 6	MNZ 2 7	CAT 1 1	CAT 2 3	1st	78
2019	SPS Automotive Performance	Valentin Pierburg	Pro-Am	LEC 1 1	LEC 2 8	HOC 1 2	HOC 2 4	SPA 1 4	SPA 2 1	RBR 1 5	RBR 2 1	SIL 1 2	SIL 2 3	CAT 1 5	CAT 2 6	MNZ 1 6	MNZ 2 2	1st	80
2020	SPS Automotive Performance	Valentin Pierburg	Pro-Am

Complete 24H Series results

Pos.	Team	Teammate	Class	1	2	3	4	5	6	7	Pos	Points
2015	Ram Racing	Thomas Jäger	A6-Pro	DUB 2	MUG (2)	ZAN 2	LEC 1	CAT 3	BRN 2		1st	117
2016	Ram Racing	Thomas Jäger	A6-Pro	DUB 11	MUG Ret	SIL	ZAN 4				5th	68
	SPS Automotive Performance	Valentin Pierburg	A6-Pro			SIL		LEC 3
	Scuderia Praha	Josef Král, Peter Kox Jiří Písařík	A6-Pro			SIL				BRN 1

Complete British Touring Car Championship results

(key) (Races in bold indicate pole position – 1 point awarded in first race) (Races in italics indicate fastest lap – 1 point awarded all races) (* signifies that driver lead race for at least one lap – 1 point awarded all races)

Complete International Superstars Series results

(key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)

Complete British GT Championship results

(key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)

^† As Onslow-Cole was a guest driver, he was ineligible to score points.

Complete FIA World Rallycross Championship results

Complete GT World Challenge Europe Sprint Cup results

(key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)