For you information
This is the site for the renewal of the Brexit carte Sejour (5 &10 year) for the Charente Maritime.
It is site for the prefecture La Rochelle
Click on the link below
The rendezvous is at La Rochelle
https://www.rdv-prefecture.interieur.gouv.fr/rdvpref/reservation/demarche/14900/
If you have any problems contact me Stephen Elliott