He won over 200 races in 20 years of competition during his motorcycle and car racing career. In his native home England during 1985, he won both BMCRC 250cc and 350cc Production Championships and also the KRC 250-350 Production Championships. Terry also won the Marlboro Clubmans final round at Silverstone which was the best of the cream of the fastest club racers in the UK in the final round. He turned semi-professional in 1987 winning British National races, 1988 saw him turning professional, racing in International events globally. In 1989 he won his first World Superbike race in New Zealand, the first ever British rider to win at a World Superbike event and came runner up in the British F1 Championship. In 1990 he won the British Superbike Championship, as well as winning the 1992 Endurance World Championship, the 1993 European Superbike Championship and the 1999 Endurance World Championship once more. He was a regular although only completing two full-time seasons in the Superbike World Championship every year from 1988 to 1994 with 2 wins, 9 further podiums, and a championship best of 6th in 1991. He raced the famous Suzuka 8 hour race in Japan four times with a best result of 2nd place with team mate Scott Russell in 1994, this was and is to this date the closest ever first to second finish in the 8 hour races history. He rode a privateer Harris-Yamaha at the 1992 British motorcycle Grand Prix and placed 6th. He made a handful of 500cc Grand Prix starts for the Suzuki factory in 1996. Subsequently, he returned to the British Superbike championship with some success - five race wins in 1996 with a Ducati, and one in 1998 for Suzuki. He won the prestigious Bol d'Or race five times, the 24 Hours of Le Mans and Spa 24 Hour motorcycle race twice.

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