Ginny Buckley puts to driving instructors inside of two super saloon cars. First of which is the best of British - the Jaguar XJR, coming with a 4 litre, supercharged V8 engine, and producing 370bhp, versus a perfect example of German precision engineering - the Audi A8, which sports a 4.2 litre engine and comes with their legendary 'Quattro' technology.