Friday 4 January 2013 7.26pm
The easiest way to find out would be knocking on doors and asking residents. However you say you're posting from elsewhere so maybe that isn't possible. If no-one else posts the answer here are some places you could try:-
Housing Associations are regulated by the Homes & Communities Agency, of which the London office website is:
Meanwhile Southwark Council
works with housing associations in the borough, which are linked through a group called SOUHAG. The following page from the Council website mentions that body:
You could email the Southwark Corporate Strategy address at the top right-hand corner of this page and ask if they have a directory of HA properties they can consult, or contact details for SOUHAG.
If both these fail you could also try the police serving that area. This is the Met page for the Cathedrals Safer Neighbourhood Team, which covers London Road