There are clearly defined communities/areas/vibrant-neighbourhoods in London like (as Louisa says) Peckham and Brixton and even (for the well heeled blower) Dulwich V. The areas in-between are featureless, bland places like ED. Suburbs that fill in the gaps. People blow in to these gaps, like motes caught on the wind, for proximity to 'proper' areas - like timid flies landing on the ankle of a carcass rather than on its split and bloated gut. ED is a 'gap'for the urban timid or the aspirationally challenged. Most people in ED, therefore, will tell friends/family who don't know London that they live in the Peckham or Brixton 'area' (under 35) or Dulwich (over 35 or still pretending to be under 35). Most (if not all) of the above is bollocks.