Julian Bailey won various races driving the T640E in the British Formula Ford Championship.
Through his own company Thorby was hired to work for a variety of racing car constructors, mainly in Formula 3.
Working with Martin Brigden and Kris Dwornik Thorby designed the first TOM'S Formula 3 car, the 031F.
Marcel Albers was very successful in the Ralt winning the opening round of the 1992 British Formula Three season.
The car was first raced by Jason Plato and later by Julian Westwood in the British F3 scoring a couple of podium finishes.
Holzer Motorsport would enter Thorby designed Mygale's in the 2005 Formula 3 Euro Series season the deal however came never into fruition.
In collaboration with Nick Wirth's Simtek company the Judd powered car was developed.
A car designed by Thorby appeared at Le Mans in 2003, the Lister Storm LMP.