Found it!!
I did a few jobs on the car recently and when I was at it, decided to have another search for the diode. Its in the Relay box, behind the fuse box and is the last item in the box. The diode was indeed old and in bad condition and I'm waiting on a replacement from a friend. Its easy to cross reference the diode numbers so no need to go to Mercedes. Mine was 1N4003.
Gerard
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