I understand that it was grounded because of noise complaints. It was so noisy that the complaints continued long after the aircraft was grounded....
Ah yes the noise! One had a RN Seaking fly over one's humble abode last week at under 500ft ago on it's way to a hospital and the sound was around for a good half minute, which at least to me was welcome. I remember the airport link service flying certainly higher and that sound could 'hang' in the air for a good while. No doubt the wealthy residents of the Sussex and Surrey countryside grew tired of this aural irritant a few times per hour and that was that ?