This issue used to drive me nuts on my XJ40s, my X-300 and my XJSes – Jaguar has this weird way (at least IMHO) that they #er their fuses within a fuse box. To me, it seems backwards and kinda upside down (i.e. if there is a row of them above/below the other). Maybe it has something to do with the 'norm" being RHD and not LHD models in the U.K., similar to the way the engine A & B banks seem to be backwards in #ering and “pairs” of interior parts of their cars as well, with “A” being the part/component on the passenger side/LHD and “B” on the driver’s.
For example, if you to to look at the 2-row fuse boxes under the front dash panels on either side (e.g. on an XJS) the #ering system seems to be such that the #1 fuse is located on the right end of the lower row, then runs to the left from there, going back to the right end of the upper row and then once again to the left from there (IIRC). Or alternatively, it runs from the right end of the bottom row across to the bottom end of that same row, then up to the left end of the top row and across to the right end of the top row. ? Reason I bring this up is I need to check out the “#9” fuse located behind the heel board of the rear seats on the left hand side (LHD car) of Harlem. This is the fuse for the radio “head unit/cassette”, and should be 10-amp (red in color). This is though one of those 2-row boxes, so precisely which of the fuses should that be, facing the box and counting from left to right across the top row, and then the bottom row?