Coventry, England  - The Jaguar XJ, which celebrates its 40th birthday this year, in a sense epitomizes the very best and worst of British motoring.

Driving an XJ is an emotional experience that clearly differs from the cool precision of taking the wheel in a Mercedes.

For a start, there is the distinct smell of the opulent leather interior coupled with neatly arranged dials on the wooden dashboard, giving it an aura of luxurious opulence.