The JAGUAR XJ (2003-07) XJ6 4DR SALOON 3.0 V6 SOVEREIGN AUTO6 is a full-size, four-door luxury saloon, aimed at buyers wanting comfort and presence rather than a small, economical runabout. In the UK used-car market, it sits among traditional executive cars, competing with models such as the BMW 5 Series and Mercedes-Benz E-Class. Its Sovereign trim gives the XJ a particularly upmarket feel. mycarcheck.com has recorded 366 checks across 157 distinct VINs, offering a useful snapshot of cars being researched. These checks show an average private-sale valuation of £3,700 and average recorded mileage of 100,000 miles. Average annual mileage is 3,000, while cars had around 4.1 previous keepers on average—figures that can help set expectations, though each car’s history and condition matter. The smooth automatic and spacious, refined cabin suit comfortable long-distance travel and chauffeur-style duties; it best fits buyers prioritising relaxed luxury, provided they budget carefully for upkeep.