if you have an interest in urban history then perhaps you could provide something to counter my flimsy anecdotal evidence. talking to neighbours every day having these people in and out your own home socially and actually having discussions about white people leaving and the make up of the area like people do in real life at school gates and community events is only anecdotal true. what we need are STATS.
I'm not disputing the accuracy of the conversations you have had. But, from a sample size of your 4 mates down the pub it's difficult to say they are representative. I am not that interested in London, but I'd love to sit down with you and discuss the roller coaster population of say Detroit. Next time I'm in London let's do it. There's some nice pubs in Hampstead.