The car you saw might well have been one of the later model E Type Jaguars (personally, I prefer the middle period E Types as the early ones were appalling to drive and later models didn't have the classic E Type lines).
The car above is a replica Jaguar XJ13. The XJ13 project was a single sportscar prototype intended for a return to Le Mans by Jaguar during the mid-1960's. Sadly, the Automobile Club de L'ouest (organisers of the Le Mans 24 Hours) altered the rules and technical specs so that the XJ13 wouldn't qualify and so the project was scrapped. There's only one original XJ13 that's owned by the Jaguar Heritage Trust after it was rebuilt, having been destroyed in a 174mph crash during a test at the MIRA test track in Wales, all the others pootling around are replicas and a good replica will set you back at least 80,000 pounds. The good news is that the normal replica version pulls about 500bhp, but if you give it to the Jaguar engineers for tuning they'll return it to you topping out at about 700bhp (this in a car that in fully stripped down race spec would weigh rather less than a ton).
Which is nice.
