A man who plunged to his death from the sixth floor of a German aristocrat’s home had been taking part in a gay orgy while bingeing on cocaine, an inquest was told today. Tony Casey, 38, had five times the potentially fatal level of the drug in his body when he plunged from the Chelsea roof terrace of Count Gottfried von Bismarck. Both men had taken part in an elaborate all night gay orgy with three others. When police officers arrived at the scene they discovered the floor of the penthouse flat in Draycott Place was littered with sexual paraphernalia....