For those seeking a COC to enable registration of their vehicle within the EU, I offer the following advice:
I just got mne for my XF. DO NOT GO TO A SITE WHICH CHARGES FOR A COC. Some are fraudulent.
Manufacturers are required to supply a COC free of charge, if one is applicable.
For Jaguar you can go to their main site and ask a question about COC (I chose the International Markets tab) I got a reply from a new email address:
jagcrc@jaguarlandrover.com
It all went like velvet from there. I'd start with this email address but I would include in your initial email the VIN and the registration number.
If one is available, they email a copy and send the original by post.
Hope this helps.