Collins was placed second in the Marlboro Masters Formula 3 championship event in 2000. He set the pace at the 2001 Le Mans 24 hours race in his first season for approximately four hours during the rain at night. After winning the European Stock Car Championship in 2003 ASCAR stock car racing he was signed by PDM Racing to do selected rounds of the 2004 Indy Racing League, but the car never appeared. In 2005, he competed in the British GT Championship in a Porsche 996 GT3, winning races on the way before moving up to the FIA GT Series with Ascari where he led races and scored several pole positions.

In addition to racing, Collins' company Collins Autosport Limited provides precision and stunt driving services, particularly for BBC Television, including Top Gear and Top Gear Live, as well as for the film industry, such as driving James Bond's car in Quantum of Solace and Casino Royale, and Eve Moneypenny's car in Skyfall.