The Vauxhall VX Lightning concept has classic roadster proportions with a long bonnet and a short rear overhang and uses the same rear-wheel-drive technical foundationas the new Pontiac Solstice built in America. Designed in Coventry at the GM UK Advanced Design Studio, it takes Vauxhall back to its performance roots and is the physical expression of pure driving excitement. Revealed in May 2003, the VX Lightning is a milestone in Vauxhall's…