I'm currently agonizing over our journey to DLP - outbound 24/3/18, return either 31/3 by train or 1/4 by car.
When we went before we drove, but stayed in Kent both ways to break the journey. This time if we drive its the full trip in a day both ways, 7 to 9+ hours depending on traffic and queues at Passport control to get back in! We think that on the way back when we are tired and depressed that our holiday is over this will be a horrible journey.
We are considering train - changing at Lille both ways. Total journey time 5:30 each way allowing an hour for check-in / passport control.
Car has advantage of unlimited luggage. If we train we will have 1 very heavy big case, 1 medium case and 1 small case + backpacks to lug around with us. Our children are 8&4 are not used to travelling by train, so physically getting on an off will be a challenge.
I am especially concerned that we may get allocated seats on the upper deck of the TGV and struggle to get our luggage up the stairs, is there anyway to ensure that you get lower deck seats?
I would welcome any tips, suggestions or advice you may have.