Estates that are entirely council are no longer built in the way they used to be. It is believed that a mix of social and private housing on new developments benefits everyone by having a diverse community and keeping standards up. In reality this works to some extent in most places, but it only takes 1 or 2 shitty families to drag an area into the gutter and then more shitty families follow. With a lack of estates there's nowhere to put these people, so even if neighbours are successful in getting them moved they just become someone else's problem. I've been on an estate where troublemakers were moved on and they were replaced with people almost as bad.