Hi All
For a while now I have had one main beam (passenger side) not working...
I checked the fuse....all ok
I checked the bulb....all ok
After asking on Rennlist, they suggested that it was the wiring harness where it goes down from the headlight into the inner wing....
I took off the wheel and inner lining and saw a break in the wiring where it is clipped to a wiring holder around 4 inches below the headlight.
I re-soldered it and all working again
So if anyone loses any single main or dipped beam for no apparent reason, the harness in the inner wing is worth remembering....
All the best Brett