IT IS Year Zero and counting at Jaguar, now under the watchful eye of the sympathetic (and cash-rich) Tata Industries. And what a coup for the Indian conglomerate, as it inherits a truly exhilarating beauty in the shape of the XF. This is the most convincing Jaguar in decades, challenging the likes of the BMW 5 Series like no English car has managed for a long time. Even the rather thirsty and expensive 4.2 V8 Premium Luxury makes for a compelling ownership proposition, and if this is a sign of things to come from Jaguar, then we say bring it on.