Fundamentally, none of this is strictly about “race”, but rather the cultural constructs we layer on to genetics. There are good and bad neighbours of every hue, of course. But the scale of white flight demands more than issuing congratulations to the second and third generation children of immigrants, who’ve done well in life and moved from Zone 2 to Zone 5 of the Central or Northern Underground lines. It’s also absurd to assume that the grandchildren of cockneys are moving still further out, just because their houses have increased in value.