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Here's a useful thread too
https://www.jaguarforums.com/forum/xj-xj8-xjr-x308-27/removing-alternator-24263/
Fyi. The top bolt was a nightmare for me, but a little heat from a lighter, some penetrating fluid plus the all important bolt extractor set on standby and a very important angled ratchet gets the job done, assuming it's stuck solid like mine.