I got the forms from the Mairie, then posted everything to the prefecture and the new licence came back within a week. Info online from your prefecture, eg Isere here: http://www.isere.pref.gouv.fr/sections/droits_et_demarches/?spl_c=546803&spl_f=N0/N530/F1758&spl_l=51&spl_p=