I drove over in March for a few days in the North of France, and didn't do anything but when I got on the ferry and went to the duty free I bought the Euro compliant kit for headlights never bothered fitting it and didn't have any problems, I wish I hadn't bothered buying it but loads of other people buying them and bottled it in case they knew something I didn't.
If you're going on the ferry it may be worth dropping off any passengers you may have before you get anyone parked next to you or if you're first on then parked next to the bulkhead (bigger doors on the SC) as the image of my wife having to climb out through the roof is one I'll remember for quite some time, when we arrived in France she walked through the car deck until it was clear, and waited for me.