The Jaguar XK & XKR (2006-2014) are the company's flagship grand touring sports cars. When launched the XK used Jaguar's existing 4.2-litre V8. However, this was replaced by the higher capacity 5.0-litre V8 in 2009. The XKR and XKR-S performance versions bolt on a supercharger, resulting in 510bhp and 550bhp respectively. What they like to drive? Read our full review to find out.