Thanks for that.
Didn't know of the Avanti and that is what it was.
I was uncertain of it being a Starship as it seemed to have a conventional tail.
The Avanti must rate as one of the noisiest airplanes of it's class - it was very loud and made me put my G&T down to see what it was.
I have only seen a Starship once and that was probably in the late 80's or early 90's when one departed ahead of me, at probably IAH or DFW.