This is what i did to fix my broken door handle.
Useful links:
Remove window - th-cam.com/video/-ZXTjlFfZYA/w-d-xo.html by the way, I did it a bit different, you can undo the window bolts while the window is up and save (do not cut) the foam. Will add a link to a short video
Where I got the idea for the nut on the metal rod, and how to unclip the plastic that attaches it to the locking mechanism - www.jaguarforums.com/forum/x-type-x400-14/how-fix-door-latch-issue-cannot-open-door-faq-48827/