If it is a development vehicle then it should be crushed or sent back to Jaguar, not sold to the general public. Most evaluation vehicles and prototypes are not built to the same standards and specifications as production vehicles. This means the car is either unapproved for use on the public road or the dealer is telling you a tall tale to shift a car that's been sitting around for long periods of time doing nothing. Either way, I would move on and choose something else.