I'm the first to snort with derision at anyone who buys a house next to an airfield, and then gets surprised by the presence of aircraft. However, aircraft aren't the problem here, it is the helicopter ops and training that has grown so spectacularly, which has caused the problems.
The family who own and run Denham have form for routinely sticking two fingers up at any of the local residents who have complained about noise. This lack of reasonable engagement was commented upon by the judge. Coupled with which, the helicopter operations have been expanding over the last ten years; new hangars have been built to accommodate this and also some of the aircraft that were occupying space in existing hangars have recently been chucked out (at 28 days notice...) to make way for more helicopters.
It's an autocratic and high-handed management style that has rubbed the locals up the wrong way, and has now also got up the nose of the judge.
As ever, there is a bit more to this than meets the eye.