Thanks for the great responses, I needed to know what was reasonable to try and achieve, I think I could make it to La Rochelle, but don't want to get too stressed if not so will just go with the flow.
I am choosing to camp because I like it, I have stayed in the formule 1 before on a trip I did in a 20 year Old landrover down to Spain it was basic but clean, so I know what to expect there.
The ferry is the cat from Portsmouth it arrives at Cherbourg @ 1300 and my return is the following Monday @ 1730 so I do have six and a bit days. I am going to head south for a bit of warmth and sunshine. I am not too fussed about particular destinations but I will travel on the D roads as much as possible and just enjoy the journey.
Thanks again for the great responses I really appreciate it.
Kind regards
Dave