Sorry, forgot to say to the OP (whilst hi-jacking your post - sorry!) that we had a great time here this summer:
www.lechiron.com
We took a ferry over to Calais, then drove the rest of the way - 7 hours there, 5 hours back (different route). Not sure if this would be too far for you. We loved the beautiful grounds, the big heated pool, the meals cooked for us by the owner on request and the way the chateau was set out worked well for several families travelling together. They also have cots, highchairs etc. We will probably go back next year if we can't find an alternative!