Hi we are due to take an 8 hr flight with a 5month old who is on formula. just a question about milk - i bought the ready made cartons for the flight there and for the return flight as i wasnt sure how id manage to get the boiled water to make up the formula. but now im wondering if heatrow allows the milk cartons? i checked the site and they say they make exceptions for baby milk but u have to taste 50% of it... ?? anyone with any experience....and has anyone taken blunted end scissors on a flight?? (to open the cartons)