Has anyone got a vista 2015 and used it as a double for baby and toddler? What do I need, upper adapters or lower and can I just put the maxicosy car seat up top with the newborn and 18 month old on the lower adaptors in the toddler seat - it’s just to cross the road to get to school twice a day, don’t want to spend loads on unmecessary bits if I don’t have to! Thanks for any advice x