Just my own experience, but I have lived in quite a few places in the UK (am white, born here, etc) and through 3 universities.
I have only noticed overt racism within the past 10 years, and mostly, sadly, amongst the 'working classes'.
Examples - In years gone by I have experienced several taxi drivers point out and insult people of a different skin tone whilst I was in the cab. Said with a fairly cocksure presumption that I would agree with them 
In bars, local shops in some areas, particularly males over middle age have attempted to pull me into conversations about why 'they' all ought to go back home and stop taking up or resources.
Prior to around 2010 i rarely heard anyone come out with such stuff, and of course the internet has made it more possible for them to talk this way online. Perhaps it just seems more visible?
I do believe a lack of education or cultural awareness is a melting pot for racism, so the more a population is pressed, demoralised and denied a decent living, the more narrow minded and suspicious they become, imo.
Lack of education is sadly synonymous with many working class, whether we want to admit that or not. It isn't politically correct to say that out loud, of course. And oddly enough, that particular demographic loathe political correctness, especially if it gets in their way of abusing immigrants or minorities.