For non-UK readers, the Estates being referred to are the large scale Council Estates that are in most towns in the UK.
Built by Local Councils from the '20s onwards to provide the Working Man and his family with decent housing, they are also known as Social Housing Estates.
Whilst most residents of these places are decent, hard working people, there does tend to be more than their share of "problem families" who cause great distress to their neighbours.
The effect of the children of such families on schools and the education of other children can be little short of catastrophic, often acting as a nucleus for other children to join in with disruption. These problems are getting worse.
Because of these problems such estates have, in recent decades, become synominous with the decline in behaviour standards of the whole country.
It is a social problem the UK suffers from that proves well the adage that "The Road To Hell Is Paved With Good Intentions."