If I was the original poster this would all sound very complicated to me, and I would be worrying about my first trip to le touquet. Filing in Le Touquet will be easy for you. Do not worry !
Filing a flight plan in Le Touquet could not be made easier. They are very helpful, and that is one of the reasons apart from being a great short trip across the water, that they are my favorite weekend bimble.
Simply fill in the paper flight plan on the table to the right as you enter the arrivals hall. Give to one of the people behind the desk. They send to the tower. Go into town and enjoy the bike ride etc.
On return I usually ask if all is ok with FP and they check with tower.
Fly back. In France its usually all made easy for you.
Enjoy your first trip. You will go back often.
EB