Hi, please help! My 2 year old and I are going on a flight to Europe soon, and the airline (Easyjet) has said we need to bring a car seat. I have never heard of this before, we are hiring a car seat the other end so I don't really want to traipse round with our large Maxi-cosi 'Tobi' if avoidable. Does anyone know if you 'have' to take the seat, or if it's a good idea? Or can they just sit on a seat like we will? Many thanks