The 2010 car just needs stick on deflectors. You'll be able to get them at any motoring shop, if the ones you get don't specify which cars they fit choose generic ones for projector headlights. As RT says, there's a small circle on the headlight to help you fit them, and make sure you get the dipped, not main headlight. I found it easiest to do in the dark with the lights on facing my garage door so I could see the beam.
You'll need a warning triangle, hi vis vests, GB sticker or EU tagged number plate etc too. A spare headlight bulb (type H7), fire extinguisher and first aid kit aren't compulsory. Check AA/RAC/Brittany Ferries for details.
The ferry to Spain is a great way to travel, I did it last year, enjoy the trip. The 'posh' restaurant at the back of the boat is great for dinner and for breakfast. Entertainment on board is usually excellent too.