Hi all, A few days back I noticed one of my dipped front headlights wasn't working (Passenger side) as people were flashing me. I have the lights set on auto. When turning turning the car on just the one starts to flicker before fully failing, if I turn the car off and back on again the same...

I have noticed that a few people have 'Auto dimming mirror' in the description of their cars - just wondered if this is something you have to have factory fitted or if you can do a retro fit? Thanks.