There is a law stating the times of day children are permitted outside. Cant remember what it was, probably to stay indoors between 10am to 3pm, like the cancer council recommends. So that might be ok.

But definately report them. If Noone speaks up then things like this keep happening. Even if they do end up being compliant its worth having the centre checked over to make sure. But from the sound of it, they arent.

Your DS current centre sounds great!