Your posts on this thread have dripped with the assumption that people living on estates are going to be more likely to make assumptions based on ethnicity. Otherwise, why would you specifically mention "some of the locals on estates like Moulsecoom" in your example? Why an estate, why not a bunch of students who live nearby (which is going to be more likely, simply because students tend to cluster together in certain areas)?
If you read my previous post, I mentioned that people living on council estates are more likely to be long-staying residents and tenants of a closer knit community. If you've lived in a place for a few years, you get to know the familiar faces. And new, unfamiliar faces stand out.
And so I mentioned the possibility of a bunch of asian or whatever students moving into a house share on an estate like Moulsecoomb, and how any curtain twitchers would likely clock the newcomers.
I don't know if you know Brighton In Bloom, but I lived there for a year and studied engineering.
Moulsecoomb estate is outside the city centre, and it's opposite the part of the campus that houses the engineering department (or was, I don't know if the department has moved buildings). (The arts department is closer to the sea front, in the city centre. Or, again, was, I don't know if this is still the case.)
I raised a hypothetical situation whereby some engineering students of foreign/swarthy appearance might move into a house on the Moulsecoomb estate, (because funnily enough that's precisely what some of my engineering classmates did, moved into a house on the Moulsecoomb estate for the second year) but fast forward to the post-9/11 world a well-intentioned long-staying resident, who was familiar with many families and other residents on the estate would notice some new young men of foreign extraction had moved into the locality, and if the police came knocking on their door asking for information about unusual activities or anything you think is suspicious, or even anything you don't think is suspicious, but is out of the ordinary, let us know and we'll be the judge of that kind of thing...
I specifically mentioned the Moulsecoomb estate because of its proximity to the Brighton University's engineering faculty building, because quite a few students would be attracted to living there if they can find a house, because it's so close to campus.
And also, bear in mind the context of other properties in Brighton, closer to the seafront there are loads of old regency houses split up into flats and bedsits. The people in those properties, and the streets housing those properties, are more likely to be transient as many of them will be private renters as opposed to property owners, and will have less of a sense of community and will be less likely to 'clock' new neighbours, because they likely won't know their neighbours, so less likely to think they might have any potentially 'useful' information.
I lived in a nice village in Cheshire years ago, apart from the neighbour on one side, we didn't know anyone living in our street, people kept themselves to themselves. If the police had come knocking and asked if anyone had moved in or out, if we'd seen any new faces recently, we wouldn't have had a clue. I live on an estate in central Manchester now, and must know at least a hundred of my neighbours, many of whom are friends, and if the police came knocking and asked about interesting characters I'd have more of an idea as to who was new and whatever... (although given the last time I spoke to the police I nearly ended up in a witness protection programme, I'd actually probably tell them to fu(k off, but that's by the by).
I'm just speaking from personal experience about the reality of communities. Some are close knit. Some aren't. And people living in close knit communities, like social housing estates, are probably more likely to know their neighbours and to notice comings and goings. Unless they're Hyacinth Bucket. Or I might be wrong. In which case it might be nice if people actually came back at me with valid arguments about how people living on Barratt/Wimpey estates and in flats and bedsits in split up houses live in a closer knit community and know their neighbours and the local characters better. Instead of just calling me a fu(kwit and a (unt as the previous poster did.
If I'm totally wrong about people living on council estates living in closer knit communities and being more likely to clock comings and goings, then by all means, point me in the direction of information that proves my own personal experience to be wrong, and I'll stand corrected.