If you are thinking about importing your car from the UK to France, you will need to change the headlights.
They can be expensive if you get them from your local French garage. You are best to get some online. Our friend gets his from ebay either the French site for French makes, Renault, Citroen and Peugeot or the German site for other makes. Even with the postage, they seem cheaper! So shop around before visiting your local garage! You could save a few hundred euros.
If you are unable to fit the headlights yourself, your French local garage should be able to help. Mine charge about 100 euros for this job. He is based near Dinan in Brittany.
If you have other interesting tips, please feel free to add a comment!
See my other posts about importing a car from the UK to France.