A UK one owner, honestly really is as new, 9800 mile 92 XJS V12 convertible green with cream interior ?

 

There's another thread on the go at the moment about the value of XJSes and whether it's going up or down. A car like you described could be worth $100 or $20000, depending on a lot of things....... If the car has sat unused for most of its life, it could need some serious reconditioning to bring it back up to useable. If it has been correctly stored and really is a time warp car, it could be worth whatever someone wants to pay for a really nice XJS.

Some pictures and /or more info on the car would help...... is it owned by a Jaguar nut ? (Ask him when the fuel hoses were changed last..... if he stares at you blankly, he's not a Jaguar nut)