Originally Posted by
Dan Dare
The original question can only be answered with regard to past and present tracks.
As indeed it was.
I should have added to my response to the OP that, because Cheam and Sutton are further east than LHR, noise from arriving aircraft will be somewhat higher when (as on most days) LHR is on westerlies because they will, on average, be at a lower altitude with fewer track miles to run than easterly arrivals.