The Daimler Double Six makes for effortless motoring. It's a Jag with extra jaaaaaaaaaaggggg. 

Introduced in September 1968, Jaguar/Daimler found new levels of style, performance and luxury for the executive market, continuing the tradition of 'Grace Space and Pace'. Initially using the 2.8 and 4.2-litre XK engines in 140bhp and 170bhp form, demand for more power was catered for in 1972 with the introduction of the fabulously smooth and quiet 5.3-litre V12 or 'Daimler Double-Six' engine in 254bhp form. Increased leg-room for the rear passengers was also catered for that year with the introduction of the long wheelbase version, which added another four inches to the car, soon to become standard shortly after production of the Series 2 commenced in 1973.