Thanks for that Peter, I'm even more confused now you see, I was under the impression that the XKR had a 4.0ltr engine I cannot consult my log boo because its with the DVLA having my private registration (hence forum name (KEN 33Y) transferred across from my Merc. However, I have just researched auto trader and the XKR is being advertised as 4.2 supercharged not 5.0ltr which appears to have come out in 2006 as an XKR-S I may be wrong. Was the difference between the XK8 and the XKR being the supercharger?