YANBU. The burn your DC was suffering should have been spotted by someone, to suffer sunstroke is horrendous.
Maybe pov depends on how prone to burning people are. I once went to a beer garden with my work colleagues for 5 mins at midday, then said I'm burning and went in. They were shocked at how quickly I burnt.
At a BBQ the other day I ended up with DD in a paddling pool, with her nappy and trousers off. Which was great, until I realised I hadn't put cream on her bum and thighs, and of course I couldn't now they were wet.
Another mum started a conversation about how we didn't need cream back in the day and never got burned. DD has v pale skin and blonde hair and protesting mother was asian. I was a bit .
Teachers surely should be on the alert for children who have stonking red burned skin? Hopefully before it gets like that? And to keep them out all day in the sun is just not on.
Going on now... But I met a friend today (italian) and she said "oh it's so hot you obviously didn't realise you have a long sleeved top on". I said that I wore long sleeved top becaue I didn't want to burn.
Sometimes people forget how tender some skin is, I think it's unforgivable of a school to force a child to stand in the full sun all day, and not even spot that they were a nasty shade of hot pink.