I did mention that there were cities from Brittany* though I wouldn't think it normal practice to classify them as continental Celts seeing as (to my knowledge) they are basically British Celts who set up on the continent and speak an insular language. Perhaps they share some cities with the likes of the Gauls but that'd seem to be from coincidence.
*not sure if Breton is a good adjective for it or not, similarly for Manx.