Found it, same place as Rog found his. But having cut the cable tie attaching it to the other +ve cables, their is still very little slack to allow access to the fuse.
Cleaned it up with some ACF 50 & put a cable tie around it to hold it together & returned it to it’s original position with a new cable tie. (Stops it contacting the frame)
4/4 Ivory 4.1:1 axle, Jaguar XE R-Sport.