to the 2003 Individual Speedway Junior World Championship in Sweden where he finished runner-up, one point behind Jarosław Hampel. His form during 2003 won Harris an invitation to take part as a reserve in the third round of the 2003 FIM Individual Speedway World Championship, the British Grand Prix, held at Millennium Stadium in Cardiff. 2004 saw Harris sign for the Coventry Bees. The following season, the Bees won the Elite League Championship, which meant Harris had won titles at all three levels of British speedway aged just twenty-two. He also represented Great Britain in the Speedway World Cup. Harris continued to ride for Coventry until 2011. International success In 2007, Harris became British Champion. Harris was selected to ride as a permanent wild card in the 2007 Speedway Grand Prix series, riding at number 15. In only his fifth full Grand Prix meeting he won the British Grand Prix at Cardiff. He was also a victim of an armed robbery, just two weeks before his maiden Grand Prix win when he was held up at gunpoint whilst out with his manager. Winning the Grand Prix was considered to be the biggest event to happen in British Speedway for several years. Off track, he was again voted BBC South-West Sports Personality of the Year. and was also voted BBC Midlands Sports Personality of the Year, beating Aston Villa footballer Gareth Barry into second place. Harris won the British Championship twice more in 2009 and 2010 and for the first time since 2004, Harris would not ride for Coventry after he moved on loan to Belle Vue Aces for the 2011 Elite League speedway season. He continued to perform well in the 2011 World Championship including a 2nd place finish in the Croatian Grand Prix. After another season with Coventry in 2012, he would join Birmingham Brummies for the 2013 season. In 2014, he returned to Coventry until the end of the 2016 season. Despite Harris finishing his Grand Prix appearances he continued to impress in Britain. He finished his Grand Prix career with a record of 103 meetings, nine finals, one win and 608 points. He also decided to compete in both divisions of the British league for the first time in 2017, riding for Rye House Rockets and Peterborough. He continued to ride in both divisions and made debuts for Glasgow Tigers, Poole Pirates and Ipswich Witches in 2018