Extraordinary, assume it is not a new school?? So school there when they moved in??!
On a much smaller scale, some tosser in our village threatened to do this to the football team after he moved into the house that is closest to the village football pitch. Said it was noisy on Sunday mornings... Needless to say it didn't go anywhere.
What do people expect?! Did they visit in the dark with ear defenders on when they viewed their proposed property?!?!?
YANBU