If you're talking about in a dive as opposed to 'straight and level' I'm sure I heard the Coronado also exceeded M =1.0. Wonder if they ever tried that officially with the Trident? I believe I heard a report of an 'inadvertant' pitch input on a test flight bringing up a recorded trace in excess of M=1.0,(pilot went to write something on his clipboard, touched the controls with it, and when he looked back at the Mach meter it showed above 1) but this was (apparently) unintentional. I know an ex OC Flying from Farnborough told me it was 'easily done' in a Victor, but that's digressing!!