As far as changing the headlights for driving in Europe is concerned the following item comes from the Elsawin workshop manual...
Converting headlights for driving on the left or right side of the road
When travelling in countries where the vehicle is to be driven on the other side of the road, both headlights must be adjusted to prevent dazzling by the asymmetric dipped beam.
Procedure
- On vehicles with MMI control console, the headlights are adapted for driving on the left or right in the menu option Exterior lighting „Headlamp converter" → Owner's Manual for the vehicle.
- On vehicles without MMI control console, the headlights are adapted for driving on the left or right in the „Guided Functions" mode → vehicle diagnostic tester.
Where it mentions the 'vehicle diagnostic tester' VCDS can be used as well.
Also as far as paying the tolls on French autoroutes I've always found the best way, providing you have a passenger as the payment machines are on the passenger's side with a UK car, is to use a credit card rather than cash. You just take a lane with the credit card sign above the gate, pull up by the machine, put your card in the slot, it goes in and immediately pops back out, take your card, the barrier goes up and your on your way. Usually shorter queues at these lanes than the cash lanes. Been doing it this way for many years and never had a problem.