Hi,Plymouth Roscoff is a nice crossing, pretty expensive though.
We like it in this area specifically Sanguinet, fresh water shallow warm lakes with sandy beaches and only a few miles from spectacular sea side beaches,google has pictures
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Just read your post, We will hopefully be traveling to Sanguinet in the motor home with the dogs next year to visit friends who live there. We used to fly but now have no dog sitters so haven't been for a few years.
I agree with everything you say. Have you visited the dune du pilat well worth it.
Dean