I'm no expert but apparently the halogen headlights on the A3 feature reflector units as opposed to projector units and thus cannot be direction altered. Having driven the car at night and seen that the pattern looked good for driving on the right I decided to put the car in for its controle technique (French MOT, only every 2 years) anyway the car has passed the test, the guy at the test station did say that the lights were a little to the left but it has passed anyway, so all is well with the world, and I don't need to spend around 400€ for new headlights !