Just one last thought, when you are choosing your route through France, please avoid any route that includes Paris. Driving through Paris at 9pm was singularly the worst driving experience of my life.
We tried it once as an alternative to our usual route. Horrendous, stressful, appalling, don't even come close.to describing the experience. I can't begin to describe the extent of the gridlock. Really pleased we didn't do it during the day.