well it is not easy to state a pattern...

1993 XJ6 Sovereign - quads.


1991 Daimler Six - quads


1994 XJ12 - squares


etc etc. Trust me, I tried to find the 100% working way to identify these, but there is none.. Unless you can see the badge on the trunk or see the engine.

Well, LondonItalian did say that people modify XJ40s with different grilles and headlights and wheels, as is probably the case with the cars shown above (especially the third one). He also admitted you can't identify them for definate from most of the images on this site. However the XJ12 was quite rare (1200 out of 200,000 XJ40s made) so it's very likely most of the XJ40s on this site are XJ6s.

What about the XJ12 versions of the Series I, II, III or X300, have were they different exterior and interior wise from the XJ6s?

It might be a mistake to automatically assume that square headlights = XJ12.
I have a 1994 XJ6 that has square headlights.


in fact there are 3 XJ40's in town with square headlights. Only one is a V12.
It is not a sovereign or VDP and AFAIK the only modifications to it are the ones I'm working on.

My info is
XJ40 V12 5.3- launched sept 89
x300 V12 6.0 launched sept 94
P60SOV is last V12 built

You're wrong tali, the XJ40 V12 wasn't released until 1993.

Yes you're right -unfortunately data sheet i was looking at stupidly lumped XJ12 5.3 with XJ40 V12- although i should have known from memory that k -reg is start of XJ40 v12s