Ok, if you're going to France, Eurotunnel is the way to go; Spain, ferry from Portsmouth to Santander/Bilbao. Camping is excellent in France, I've done it often; probably same in Spain but I haven't camped there.
Make sure you read up in advance what the speed limits and other traffic regulations are; they're similar but different to here in England. Don't even think about drinking and driving and be careful the morning after as well.
Take out breakdown cover.
You'll love it