Valdas changed it with a brand new BMW part. It works perfectly as in the level adjusts as it should. The problem is those 2 lines that are projected from the driver's side headlight (rather than 1), so if you adjust one of the lines, the other will be outside the correct tolerance. I wonder is there any chance it could be the bulb? Do Xenon bulbs behave this way when they're about to go? I understand Xenon bulbs are bloody expensive so don't want to replace it if it's not going to make a difference...