Button arrived in F1 after a season in Formula Ford and another in F3.
BBC: How good is Button?
So Button graduated to car racing as a 17-year-old in 1998 in the British Formula Ford championship.
He duly won the championship and the prestigious Formula Ford Festival at the end of the year.
The Ulsterman has also won in GP2, British Formula 3, British Formula Ford and was a test driver for BAR-Honda.
BBC: Adam Carroll takes 16th in IndyCar debut
Robertson had underwritten the Formula Ford programme but, to maintain that momentum and perception, a top Formula 3 drive was needed next - and the budget didn't quite stretch.
Jaguar entered Formula One in 2000 after Ford took over the Stewart team founded by three-times world champion Jackie Stewart in 1997.
BBC: SPORT | Motorsport | Formula One | Red Bull snaps up Jaguar F1 team
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