Rolls-Royce has christened its latest concept the 200EX--a name that picks up on traditional terminology harking back to some of the company&#146;s more flamboyant prewar &#147;experimental&#148; prototypes and subsequently revived on the 100EX in 2004. However, it is well known that the luxury sedan will head into production as the long-awaited rival to the Bentley Continental Flying Spur.