This from the BBC website re Kate Hoey comments:
1154: Kate Hoey, MP for Vauxhall, tells the BBC there should be an "inquiry into the increasing numbers of helicopters flying around London" among so many new high-rise buildings.
She says: "The river is a kind of motorway for helicopters, but the noise of course is horrendous sometimes, when we get a lot of helicopters hovering. Maybe we've come to take it almost for granted that people have the right to take their helicopter over London at any time and I think we may have to look at that."
I'm no expert but I think the only helicopters that hover over central London are police and air ambulance.