What we have here is a 'noisemap', compiled by and freely available from Defra, the 'Department for environmental, food and rural affairs' at URL: http://ww2.defra.gov.uk. All I had to do was search for the post code 'SE14' and it presented me with this map. From here I can deduce that the level of noise pollution on New Cross Road (essentially just the stretch of road running from West to East in the centre of the map, see below post on using google maps to compare) is at very high, unhealthy levels.
Offered on the same page we then have access to 'population exposure' which gives the following pie chart:
Whilst of course this sort of chart has its limitations it does strongly indicate that there is a minority of about 5% in the area bound by the above map that lives with a level of noise deemed as unhealthy by this particular government agency. Also from the streetview tour I conducted earlier it was clear that above all the shops there are residential homes (one could zoom in and inspect courtains and sometimes even see into people's living rooms). These most likely make up the bulk of the 5% who suffer noise of 70 dB and over.
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