Model HistoryToday’s XJ6 is the fastest-selling Jaguar ever, and one of the world’s most outstanding lux- ury saloons. But its gestation period was long and stressful, embracing as it did Jaguar’s dark years under British Leyland. For Jaguar had ceased to be independent when Sir Wil- liam merged the company with BMC in 1966, the resultant BMH amalgamating with Leyland in 1968 to form British Leyland. But by the time the new XJ6 arrived, Jaguar had once more become...