Atomcraft. If you can find PPRUNE you can find other appropriate websites that detail;
1) Aircraft noise is only legislated at airports
2) If a particular aircraft is causing noise nuisance but is not breaching the Rules of the Air the CAA don’t have legal power to restrict its activity. We advise that if possible you contact the operator of the aircraft.
3) Heights wise (trying to keep it simple) minimum 500ft from (not necessarily above) (non congested area) or 1000ft above highest fixed point within 600m (congested) else for helicopters; can fly closer than 500ft when taking off and landing. Of course some helicopter may even be operating legally lower than the above - utility/police/HEMS/SAR.
Luckily it's raining today eh? No lawnmowers cutting the grass. And something else to complain about! (damned weather).