Problem with Gatwick is housing around it are very well priced for the posh, they want a million pound property in tranquil conditions... My advice would be move to peace pottage, clue is in the name.
Seriously though is it a legal nightmare if the local council gives them reductions on council tax? Does it open a can of worms, what else can they get, is it disproportionate.
My mum's mum lives in a neighbouring neighborhood, the value of her property will only go up with a second runway. She's not fussed about noise. Old age may have deafened her anyway