Just eleven years after the launch of the E-type, Jaguar stunned the world with another car capable of nearly 150mph, only this time the car was a 4 door saloon! The new car, known as the XJ12, looked nearly identical to its six cylinder sister car, the XJ6, which must have surprised a few autobahn users!. As with other models in the Jaguar/Daimler range an upmarket Daimler version was also offered, the Double Six.
The name Double Six, (an old fashioned way of writing V12!) harked back to Daimlers heydays in the 1930's when its last V12 limousine model was also called the Double Six. The XJ12 and Double Six shared their new engine with the new V12 E-type and developed some 253bhp, unfortunately fuel consumption figures were alarmingly low even by Jaguar/Daimler standards.