We had to leave a stamped postcard at school at the end of the summer term for our results to be sent to us (school mainly boarding and this was back in the days when everything was on paper). I was abroad at the time, staying with a schoolfriend and my mum gave me the card when I got back. It had not occurred to either of us that conveying the message any earlier was worth the hassle and cost of an international telephone call
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As his school is positively encouraging them to go in on Tuesday, DS2 will do that, although he will probably log in to the school system and Track first (if nothing else, because that can be done without getting out of bed).