Being as you are driving you will be crossing borders even though there is supposed to be open travel in Europe you could be stoped. Have a look at a European fire arms permit the details are on line. My boy was posted to a Germany and he got one. A pain in the butt geting one in the UK as sup 12lbs is not a fire arms cert item. You will also need to tell the ferry company or the shuttle one that you are carrying a sub 12lbs air rifle it will have to be kept locked in the car and secure.