In 1996 he followed several other "coming men" of the time, such as Dario Franchitti, Juan Pablo Montoya and Jan Magnussen, into the International Touring Car Championship, driving a JAS Engineering entered Alfa Romeo.
He also kept his single-seater ambitions alive by contesting a round of the British Formula 2 championship for Fred Goddard Racing.
Watt's career had progressed as far as the International Formula 3000 championship by 1997, where he was a consistent frontrunner and was recognised as one of the best up and coming talents.
In 1997 and 1998 Jason drove for David Sears' Super Nova Racing team, under the Den Blå Avis banner, in deference to his major sponsor.
Watt's single-seater career was curtailed by a motorcycle accident during the off-season late in 1999 which left him paralysed from the chest down.