Mine are in school, they've hired a gazebo and tied parachutes to the trees to create shaded areas. They will have regular breaks for drinks and toilet visits and go outside for fresh air for short periods.
I would understand parents keeping their kids at home to play in the garden/paddling pool and keep cool in the house, and feel more in control of the situation.
Don't understand anyone going to the beach but claiming school is unsafe.
Some people are getting caught up in the hysteria and forgetting that many of us go on holidays abroad where this weather is normal and we sit at the pool or on the beach in this heat every day.
The UK is not built for these temperatures on a regular basis, so it's uncomfortable, but it's really not 'dangerous' if people are sensible.
Wear plenty of sun cream and keep it topped up, wear a hat, take a pop up tent for kids, don't stay outside for too long, drink plenty of water etc.........
But the woman is a idiot for claiming school is unsafe then going to the beach.