Interesting to look at E London Pax comments. He probably reflects most landlubbers in that he doesn't give a s**t who flies over his house at 2240 or whatever - he wants to lash out at someone and "put a stop to it". If it is flying over London at night (out of Battersea's normal operating hours) it is a 95% probability to be the Met or one of the other police ASUs. Most of the other 5% will be catered for by Air Ambulance or SAR operating in a similar role. They will all be (rightly) protected, but the emotions that are generated by those who are anti will have a go at an easier target, that is essentially nothing to do with night helicopter flying over London.
It is a shame that the Met chose a noisy "new" helicopter fleet, but that is water under the bridge now.
Those of us concerned to see commercial helicopter flying continue and prosper in and around London need to make sure that the fact that noise from hele night flying over London is not due to commercial traffic is understood and appreciated.