For me it's the Mark 10/420G. Big limo aimed at the lucrative US market but considered too large for many other countries, particularly the UK with its narrow lanes and back roads. Perfect size for a big place like Australia though and pure class with lashings of walnut and leather inside. A pretty spirited performer too with excellent handling for a car of its size. Only now starting to be appreciated for its many attributes, after being widely ignored by Jaguar enthusiasts for decades. Grace. Space. Pace. That's the mighty Mk 10.