The only reason I mention the Asians, if that's what you meant, was to show that I was in other parts of London besides where the tourists visit, for what it's worth. I was not suggesting there is any racial characteristics among the homeless, although there may be. Don't ask me.
I didn't invent any of those words and other use the expression "public nuisance," because, to them, they, the homless, are. And their solution to their perceived problem (their problem, not the problems of the homess) is just to get them to go somewhere else. Of course, that sort of thing happens to people who actually own houses, not just the homeless, but that's a different story.
There is also in this country a population of migrant workers who spend their lives moving around mostly doing farm work, especially at harvest time. They usually live in what might described as camps and camps they are, because they are there only temporarily. They have families, too. So among other things, children may not attend school. But these people do have an economic function, to be sure.
The funny thing about this thread is that the whole point of the forum, as I see it, is about a sort of primitive life. It's all about camping, self-reliance, getting out of the house and so on. Then there are people who actually have to live like that.