His career stalled somewhat when he returned to British Formula 3 in 2000-01.
A move to British Formula Three for 1991 followed and again impressed, finishing fifth in the championship.
He had two poor years in British Formula Three compromised by lack of budget.
In 1989 he made one start in the inaugural season of British Formula 3000, which was good enough for 13th in points.
He returned in 1986 and won it before graduating to British Formula Three the following season.
He was also the winner of the 1982 British Formula One Championship.
Warwick spent three seasons from 1988 to 1990 in British Formula 3.
British Formula 3 has long been the traditional training ground for the stars of the future.
He then spent two years in British Formula 3, finishing the 1985 season third in the championship.
He switched to British Formula 3 in 2002, finishing seventeenth in his first year.