RML (2009)

He made the step up to the British Touring Car Championship in 2009 after being linked with Tempus Sport he completed a deal to race a third Chevrolet Lacetti for RML, making his debut in the fourth meeting of the season at Oulton Park.^[1]

Nash was running in second place in his ninth BTCC race at Snetterton when he made contact with Airwaves BMW driver Rob Collard, who went spinning off the track before rejoining in a heavy collision with the BMW of Stephen Jelley. Nash went on to win the race but was excluded for his part in the incident.

Triple 8 Race Engineering (2010–2011)

Nash was without a team for the first meeting of the 2010 season, but was signed by Triple 8 Race Engineering to replace Fabrizio Giovanardi from round two onwards.^[2] At Snetterton, he finished tenth in the second race, before the reverse-grid system handed him pole for the final race of the day,^[3] but he spun out of the lead on lap two and Gordon Shedden went on to take the win.^[4]

He returned to Triple 8 for a full campaign in 2011,^[5] with new teammate Tony Gilham in a second Vauxhall Vectra. He took his first career win in the reversed grid race at Rockingham, he started from fifth but led front row starters Rob Austin and Rob Collard home to the finish line.^[6]

He went to the final round at Silverstone in mathematical contention to win both the overall drivers' championship and the independent drivers' championship,^[7] a podium finish and two non-scores could not get him the overall championship but the independent victory in race one secured him the independents' trophy with a 32-point advantage over rival Mat Jackson.^[8] He also helped Triple 8 to secure the Independent Teams' Trophy.

Team Aon (2012)

After claiming the BTCC Independents Drivers Championship in 2011, it was announced in February 2012 that Nash would move to the World Touring Car Championship to partner Tom Chilton at Team Aon.^[9]

He started on pole position for the reversed grid second race at Marrakech and held off Franz Engstler in the early laps before eventually being overcome by Yvan Muller. He finished the race in sixth place, scoring his first WTCC points. He qualified fourth for the next round at the Slovakiaring but was given a ten-place grid drop for failing the ride height check.^[10]

Near the end of the Race of Hungary race two, he pulled off the track two laps from the end with a car problem but was classified 19th and last. He scored a point once again in race one at the Race of Austria and then repeated the feat in race two, coming through the field when many other cars were suffering punctures as a result of aggressive cambers. Nash retired from both races in Portugal due to a collision in the first race and a set up error in race two. An engine change for both Fords at the Race of Japan sent Nash to the back of the grid for the first race.^[11] Engine problems in China meant he failed to finish either race, with his retirement in the second race being at the end of the warm up lap. Nash finished the championship in 20th place, two places above his teammate despite having not scored points since Austria.

Bamboo Engineering (2013)

In December 2012, Bamboo Engineering announced that Nash would drive for them in 2013, competing in a latest specification Chevrolet Cruze 1.6T.^[12] He qualified fifth for the first race of the season and finished seventh in both races. He was second in the independents' class in both races which put him at the top of the Yokohama Independents' Trophy going to Morocco.^[13] He finished on the overall podium in the WTCC for the first time at the Race of Morocco, coming home third in race one.^[14] He then finished fourth in race two having started ninth. He finished outside the points for the first time in 2013 in race two of the Race of Slovakia having run off the road and through the gravel traps on the first lap. He recovered to finish seventeenth.^[15] At the Race of Austria after qualifying, Nash was investigated along with thirteen other drivers but no further action was taken.^[16] Twelve drivers were issued with grid penalties for the first race, moving Nash up from tenth on second on the race one grid while he would start from pole position for race two.^[17] Having finished second in the first race, he claimed his first overall WTCC victory in race two.^[18]

Belgian Audi Club Team WRT (2014–)

In 2014, he will compete in the Blancpain Endurance Series for the Belgian Audi Club Team WRT,^[19] in car number 2, alongside teammates Christopher Mies and Frank Stippler.^[20]