Brits have been racist's for generations, especially when it comes to black people, mainly because they have been brought up to believe that the colour black represents evil.
Most of the things people fear are black, because it represents darkness, funerals, witchcraft, voodoo, bats, the unknown, Halloween, the dark side, in Britain people always dressed in black at funerals, witches wore black, black cats were seen as unlucky, the night is black, we believed hangmen dressed in black, they even have a place that holds weapons XYZ of white murderers called the black museum, why not call it the white museum.
If u want to buy something thats not good, you go on the black market XYZ, where as the colour white represents goodness, clear, plain, unstained, cleanliness, purity, angels, light.
However I think it is changing and probably will get better because just as we were brought up with this fear, future generations will be brought up with not just black people but all nationalities and racism will decrease. It is only what was instilled in us through generations.