I suspect they said to him "does your dp usually pick you up" and he said "no, I walk home- df's at home".
No, they shouldn't have let him go, but they had left messages and I would guess asked him-which in year 6 is reasonable. And he was sensible about it too when he found you weren't in.
At secondary next year he will be just released and that feels very scary when they're new year 7s.
A few weeks ago, ds (just 9yo)'s afterschool club was cancelled. The first thing I knew about this was a call from dd2 saying ds had arrived home.
They hadn't bothered phoning round to tell us, and had told the children to go to the afterschool club. Unfortunately this is a big school and ds' form hadn't got the message. He came out to do it and found it wasn't there. Looked for the judo van and saw it wasn't there. So walked home. 50 minute walk-he'd have been on his own as well because he'd got to get changed and then find it wasn't there so everyone else had gone.
I was not impressed firstly with him:
He should have gone and asked at the office. The girls would have done this without considering another option. Unfortunately in emergency situations ds tends to go into army initiative tests. May save his life some time, I guess, but at times it isn't helpful. So he considers what to do and his conclusion was he needed to be home. He has a mobile in his bag so could have even called me (although he's not meant to at school, it's under the lining as emergency. This was the time to use it!
Secondly at the school: The fact he hadn't been told was not good. But that they hadn't reacted to him being missing was a huge safeguarding issue.
In all honesty, as it turned out well, I'm very glad the first thing I knew was a call saying "ds is here". A call saying "ds should be at afterschool club and we've no idea where he is" would do much worse things to my blood pressure.
I was tempted to go down to school and pretend I was there to pick him up, and see what the reaction was. However I didn't. I went in and saw the head instead, and he was quite horrified, so I don't think that'll happen again.
But as another thing I would have been very unimpressed to find him in the afterschool club and me not given the option of picking him up simply because they will have charged everyone for it!