That “mighty rumble” was more of a crackling, bowel-shaking roar of the air literally being rent apart by 4 reheated Olympus engines. How we all miss it! Kingston would definitely have stopped and noticed Concorde departing on Easterlies with a standard (noise-abatement 😂 ) departure starting the turn around Hounslow Heath area, but radius of turn related to speed and quite a large so I guess the east of Twickenham would have been overflown and noise focussed further east. If you listened carefully I expect you’d have detected them departing on Westerlies too.