Wherever we go on holiday we have allways taken our own carseat. This time we are not hiring a car and are trying to travel light. We will be taking a taxi or minibus to/from the airport in Spain and am not sure if it's the law for a child of 3 1/2 to be seated in a car seat or would it be ok to have him sitting on my lap strapped in? I don't like doing this though- Would you take your own carseat regardless of weight just to know that your child would be safe?