A mate of mine, who used to park overnight occasionally at Denham, once received a letter from a supposedly aggrieved local who claimed he had been flying low over his house.
It subsequently turned out this character was systematically doing this to any aircraft where he could identify the reg - a typically NIMBY-ish form of harrassment.
The CAA had to threaten him with prosecution because the aircraft he was "complaining" about were quite legitimately taking off and landing. They argued that putting pilots under unecessary additional pressure or causing them to deviate from a normal flight profile could possibly lead to an accident.
Personally, I think the best way would be to have to register a legitimate interest - like you do for the Met Office and AIS web sites.
As things stand there is certainly scope for people to create mischief from G-INFO, if they so desire.
RD