Driving to Spain is a doddle. Both France and Spain have great roads, much better than the UK. For France, the route you require is in the link you have copied. I suggest you give it a good read and then come back to me with any further questions. As for Spain, have a look at this link below and again I'll try and answer any questions you have afterwards.Just had my ferry cancelled as well. Never driven down to Spain before. Are there any roads do avoid in a 7m motorhome? Would preference not to pay tolls but need to know if I should go on some of them ?any recommendations which tolls to use and avoid?
http://about-spain.net/travel/map.htm
Both these links can be found in the resources section if you need to look for them again.