Bob from Brockley takes up the issue at http://brockley.blogspot.co.uk/2015/04/h...re-in.html
...But the figures are out of date. The [Migration Watch] briefing says that for its "local connection" requirement for getting social housing, Lewisham "just requires the applicant to be resident in the borough". Since then, Lewisham has instituted a two year residence rule, which will have dramatically cut migrants - and certainly new migrants - from the waiting list. Tory reforms have made it harder and harder for migrants to get access to council housing too, further cutting the numbers. (To be eligible, you need "settled status", i.e. permanent residence; to get that you need to have already lived here for three or in most cases five years plus pass a "Life in the UK" test that most of us Brits would fail.
I recommend reading Bob from Brockley in general, but particularly this article.