So I've discovered after booking our holiday that we're driving through France on Black Saturdays, which I didn't know about.
We're driving from Roscoff down to the Charente Maritime (Saint Palais Sur Mer) on Saturday 29th July, and then back up on Sat 5th.
Is that route likely to be horrendous? Our ferry actually gets into Roscoff on the Friday at 8pm and we were going to book a hotel there before setting off Sat am, but I'm thinking now that we'd be better off driving for a couple of hours on the Friday evening and staying overnight further down in Brittany. Presumably the roads won't be too bad in the evening?
Luckily our ferry home isn't until Sun 6th, we'll be staying overnight in Roscoff so if it takes all day to get back up on the Sat at least we won't be panicking about making the ferry!