Series 1 XJ restoration projects can sometimes be found advertised from £5000 or less, depending on their condition. At the time of writing, we spotted a rare 4.2-litre XJ6 with a manual gearbox, a car in need of renovation work and advertised at £3750. Restored examples, however, appear to vary greatly when it comes to values, with asking prices ranging between £10,000 and £30,000. The more you pay, the more you should expect in terms of originality or standard of restoration, with lots of evidence to back it up. Somewhere around the middle of the price range will secure a Series 1 4.2 or an XJ12 (the latter a rare machine thanks to its very short production run) that’s been extremely well maintained and is presented to a high standard,…