In the house I have lived in for the past 19 years I rarely now hear aircraft that much (Sutton) the last one that always made its prescence felt was Concorde - in the house I previously lived in (1.5nm NNW from 'Croydon Airport') I always heard turbo props, noisy jets etc., Now the din is noisy helos - but not many. The airways are MUCH quieter these days.
However, in the summer, as I am on the SE corner of the Lon TMA, the occasional spitfire and others pass, transiting to air shows. Even SVFR's are few and far between
