The problem is that these people have moved to accomodation built next to a heliport that has been operating since 1959.
At the time it opened it was an industrial area. Now planners have allowed massive, high rise housing development far too close to it, the only thing that the operator can do to alleviate noise is to cease operations. I don't see how the owners should be banned from running their business; it is perfectly legal for them to do so. Maybe the complainers could move somewhere quieter, such as near LHR's third runway.