Best way to plan a trip through France is by using MichelinMaps Detailed online maps - UK maps and worldwide maps - ViaMichelin
Bear in mind that the speed limit for country roads in France has dropped recently to 80kph (50mph) which has also seen a host of speed cameras introduced to make money from the changes.
I've used the N10 to get down to Angouleme before (Brother has a house in Nontron) and it is fairly quick but we usually have a stop off somewhere in between the tunnel and his place.
If you have someone else who can do some driving it might be possible in 3 days but I'd be tempted to do the Portsmouth-Santander ferry overnight, then a stop in the middle of Spain around Madrid before the final push to the south coast. It's a long way to go in 3 days.
Bear in mind that the speed limit for country roads in France has dropped recently to 80kph (50mph) which has also seen a host of speed cameras introduced to make money from the changes.
I've used the N10 to get down to Angouleme before (Brother has a house in Nontron) and it is fairly quick but we usually have a stop off somewhere in between the tunnel and his place.
If you have someone else who can do some driving it might be possible in 3 days but I'd be tempted to do the Portsmouth-Santander ferry overnight, then a stop in the middle of Spain around Madrid before the final push to the south coast. It's a long way to go in 3 days.