Sorry for my late reply, apparently I have missed or I don't get a notification in my e-mail.
Have you found the diagnostic connector already?
It should be a brown connector with a "dummy" connector connected to it. If you have a LHD with the ABS unit on the RH the connector is just underneath the ABS unit.
If you cant find it under de hood, then try in the back under the battery, in this topic:
https://www.xj40.com/viewtopic.php?t=998442&start=50
there is a picture with the battery in the back and the black diagnostic socket underneath.
Good luck!
My regards,
Gijs