If you don't wish to travel via plane or drive considerable distances in your vehicle you can always catch a Brittany ferry from Portsmouth to either Bilbao or Santander. Once docked at either port you have either a 4 hour drive from Bilbao or a 5 hour drive from Santander to your destination. On a positive note you will feel more refreshed and have less wear and tear on your vehicle and its occupants, in particular small children.
"Las Moulinières" is open for business all year round including Christmas and New year. English is the preferred language of choice with some French spoken. Prices are advertised in GBP. Payments from countries outside the European Union are worked out at a daily GBP rate at the time of booking.