Simpson began karting in 1991, competing until 2011.[4] During his karting career, Simpson won the Super One Series three times in Rotax Max and once in Formula KGP,[5][6] as well as the 2003 Rok Cup International Final in the Senior class.[7]
In the midst of his karting career, Simpson made his car racing debut in 2004, competing in Renault Clio Cup UK.[4] Following one-off appearances in the Ginetta G50 and GT4 European Cups in 2008 and 2009,[8] Simpson made his full-time return to cars in the 2011 British GT Championship for Stark Racing, as he began a long-term relationship with Ginetta Cars.[9] In his first season in the series, Simpson scored two points finishes, with a best result of ninth at Rockingham as he ended the year 25th in the GT3 standings.[10]
Simpson nursing a damaged Ginetta G50 at Oulton Park in 2013.
Returning to the series for 2012, Simpson competed for Century Motorsport in the GT4 class at Oulton Park, finishing third in race two.[11] Following that, Simpson returned to the GT3 class at Rockingham for Optimum Motorsport,[12] before returning to Team LNT for the final two rounds, in which he scored a best result of fourth at Silverstone.[13] During 2012, Simpson made various one-off appearances for Ginetta-fielding teams in Europe, most notably competing for Nova Race at the 24 Hours of Nürburgring and in the Ginetta G50 Cup Italy.[14][15] After returning to British GT with Team LNT for 2013,[16] Simpson switched to Challenge Endurance GT/Tourisme V de V for the following year, qualifying on pole four times in the seven race season.[17]
Continuing with Team LNT for 2015, Simpson raced with them in both the LMP3 class of the European Le Mans Series and the GT3 class of the British GT Championship.[18][19] In the former, Simpson took a lone podium in the season-opening Oulton Park round as he ended the season eighth in the GT3 Pro-Am standings.[20] Competing in all but one round of the latter, Simpson finished second on debut at Silverstone and took his only win of the season at Estoril en route to a fourth-place points finish.[21]
Remaining in British GT for 2016, Simpson raced for Tolman Motorsport in GT3 Pro-Am for the second consecutive season, scoring a best result of sixth in race two at Snetterton.[22] In parallel, Simpson raced in the Challenge Endurance V de V for Team LNT,[23] taking four wins and securing the PFV class title at Estoril.[24] At the end of the year, Simpson joined ARC Bratislava to race in the 2016–17 Asian Le Mans Series in the LMP3 class,[25] taking a lone win at Buriram to end the season third in points.[26]
Simpson remained in the V de V Endurance Series for the rest of 2017, driving for both Simpson Motorsport and Pegasus Racing as he scored two wins to end the year third in the PFV points.[27] In parallel, Simpson drove in select rounds of the British GT Championship for Century Motorsport in the GT4 Pro-Am class, in which he finished on the class podium at Donington Park.[28] The following year, Simpson primarily raced in the 24H Proto Series for Simpson Motorsport, coming runner-up in the Continents series after winning all three races,[29] and winning a truncated European Series at Silverstone.[30] During 2018, he also made his FIA World Endurance Championship debut at the 24 Hours of Le Mans for CEFC TRSM Racing in the LMP1 class.[31] Following a cameo appearance in the LMP3 class of the 2018–19 Asian Le Mans Series for ARC Bratislava,[32] Simpson returned to LMP1 competition by racing in the first four rounds of the 2019–20 FIA World Endurance Championship for Team LNT.[33] After the Ginetta LMP1 programme met its demise in early 2020,[34] Simpson didn't race for the rest of the year, only returning to racing in 2021 with a one-off appearance in the British GT Championship for CWS Engineering in GT4 Pro-Am.[35]
Having been a Ginetta factory driver since 2008, Simpson left the role in 2022 to become the brand's Head of Motorsport.[36] Simpson then made select appearances in the 2022 24H GT Series for CWS Engineering,[37] and the 2023 British GT Championship for Toro Verde GT in GT4 Pro-Am, in which he finished on the class podium three times.[38] In the winter, Simpson drove in the 2023–24 Middle East Trophy for Toro Verde GT, in which he won two of the three races, including a class win at the 2024 Dubai 24 Hour to seal the GTX title.[39][40] Simpson then joined CMR for 2024, as he raced for them at the 12 Hours of Spa-Francorchamps in GTX and select rounds of the European Endurance Prototype Cup in LMP3.[41] Amid a promotion to Ginetta Motorsport CEO in 2025,[42] Simpson made a number of cameos with CMR, most notably taking an overall podium in race one of the Spa round of the GT4 European Series.[43]
At the start of 2026, Simpson competed in the UAE races of the 2025–26 24H Series Middle East for CMR in GTX,[44] finishing on the podium in both races to secure the class title.[45] For the rest of the year, Simpson remained with the team to race in the GT2 European Series.[46] In his first season in the series, Simpson took class wins at Spa and Zandvoort to secure runner-up honours in Pro-Am.[47][48]
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British
FIA Bronze (2015) [1] 
FIA Gold (2016–2017, 2020–2025) [2] 
FIA Silver (2018–2019, 2026–) [3] 
