Coventry’s game changer holds steady in the sub £20k market, having bounced back from a lockdown plateau. MARKET TRENDS JAGUAR XJ6 SI-SIII (1968-1987)The XJ6 galvanised Jaguar’s strategy for more than five decades – and while the full name plate may have died with the X350 series, it left a legacy of affordable three-box luxury for enthusiasts to enjoy.