Generally there is a lot of propaganda around at the moment, so take that with a pinch of salt. The UK is not as well off as the US generally, but this does not mean there is a breakdown of society or law and order.
The propagandists would have you believe that there is a massive crime wave and social breakdown due to immigration, but what people are mostly worried about in actuality is job uncertainty and backlogged public services.
There are areas of wealth and of deprivation both inside and outside London. There is political and economic uncertainty because the UK economy is imbalanced, and most people expect a difficult few years and are sceptical that the government knows how to fix the issues (and that vested interests won't prevent the solution)