Although some no doubt had a valid reason for complaining, I heard about an excellent way of getting shot of persistent noise complainers:
"I wish to complain about the noise of your aircraft"
"Good evening, sir. Before you continue, may I ask whether you wish to make an official complaint. Because if you do so and then wish to sell your house in future years, you will then be obliged to advise any prospective purchaser that you have had occasion to make an official complaint about aircraft noise, which might well have a detrimental effect on the potential value of your property. Failure to make such a disclosure could well lead you to be liable for a claim for misrepresentation being made against you. So, sir, do you now wish to make an official complaint?"
"Errm...."
"Or will you accept my assurance that every effort will continue to be made to minimise the noise of our aircraft, but on some occasions there may be compelling operational reasons which may have to take priority"
"Errrm, oh OK. Good night"
"Good night, sir....CLICK"