The Chief Spoilsport had the tv on and mentioned something about letting me out into the garden after the flypast so I sat and waited patiently. There were some boring clattercopters which I ignored but then I heard it.
It was very quiet so I listened a bit harder and YES! There it was, a lovely Hercules.
The only problem was the ceiling prevented me from seeing if it was flying very high over my house.
I haven't seen one for about two years now but I haven't forgotten them. I think there ought to be more of them in these flypasts.