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Yeah I saw the part number and the notation on the sticker but searching the part number on the Jag heritage site come up "no such part" so not sure?
Oh and you have to undo that big bolt to get to the circuit boards in the fusebox.
I can't find the part numer at jaguarmerriamparts.com, either. From the size of the pins, it probably is not suitable for battery power distribution, but it could be related to ignition-switched power or ignition-switched grounds. If your car has a splice box like that, there are probably only a few places it would be mounted:
Behind one of the knee bolsters/underscuttles or near a corner of the dash, perhaps mounted on the climate control blower motor housing
In the center console
Somewhere in the trunk behind a carpeted trim panel