Every school sends a kit list. Almost none of them tell you what actually matters once your child is standing in a car park in Yorkshire in September, with four suitcases and no idea which one has the wellies. Pack for four seasons, not one British weather changes within a single afternoon, not just across the year. Skip the one heavy coat; build a layer system instead. A proper waterproof coat - "shower-resistant" is not the same thing and you will find this out the hard way