Concorde didn't fly over London at supersonic speeds, and I doubt it often flew over London a cruise altitudes. The problem with Concorde on approach/departure

Concorde didn't fly over London at supersonic speeds, and I doubt it often flew over London a cruise altitudes. The problem with Concorde on approach/departure was largely a function of its engines, rather than speed. https://hansard.parliament.uk/Commons/1973-07-18/debates/4279b473-5235-41e3-923e-580f3df10e57/Concorde(NoiseLevels) https://hansard.parliament.uk/Commons/1973-07-18/debates/427... shows it was comparable to slightly older aircraft at the time of introduction (VC10, B707, DC8) but notably louder than what was arguably its biggest competitor (747-200). In later years, continued improvements in aircraft noise pollution meant the margin between Concorde and other aircraft operating out of LHR just grew larger and larger.