Re: Beam bending for the other side of the Channel
For the 'old' 156 Alfa used to sell a clip on plastic cover for the headlights which was for beam conversion. It was a piece of sh*t with clips that broke off soon as look at them. (Yes I found out the hard way). I don't know if they have a part for the 'new' 156.
The easiest way is black electrical tape to mask off the part of the beam which goes high and to the left (for right hand drive cars to illuminate the left hand kerb). Remember that this part of the beam comes out of the lens which is low and to the right, (looking forwards from the drivers seat) the lens reverses everything. Remember also that the lens is polycarbonate, not glass, which means that it can easily be scratched with abrasive cleaners, and some solvents which you might try to remove the tape adhesive afterwards can disolve the surface of the lens.