The JAGUAR XJ (2003-07) XJ8 4DR SALOON 4.2 V8 SOVEREIGN AUTO6 is a large, four-door luxury saloon, sitting near the top of the UK used-car market rather than among everyday family hatchbacks. Its elegant styling, spacious cabin and smooth V8-powered automatic drive give it a traditional, comfortable feel, with Sovereign trim adding a particularly well-appointed character. mycarcheck.com has recorded 218 checks covering 97 distinct VINs, a useful snapshot of interest in this model. Across those records, the average most recently recorded mileage is 112,000 miles, annual mileage averages 3,000, and cars have had about 3.4 previous keepers. The average private-sale valuation is £3,700; condition, history and upkeep will make a big difference at this age. Best for buyers wanting long-distance comfort and rear-seat space, the XJ8 is a distinctive alternative to a Mercedes-Benz S-Class or BMW 7 Series, but its V8 can cost more to run than an ordinary saloon.