I well recall Westland’s noise expert (Tony Pike, who earned my total respect) years ago neatly summarising all the considerable research into air/heliport noise as:
1. The volume of complaints is directly proportional to the price of the adjacent houses.
2. The only way to mitigate is to involve the neighbours. I’m still amazed that London City was built at all; I believe it was achieved in large part by neighbourly involvement such as giving jobs at the airport only to locals.
I fear it is too late for Mr Farrand, but the message is to cuddle the complainers early and consistently, not to flounce out