Britain’s post colonial reckoning can be summed up in a single sentence delivered last June at the Glastonbury music festival when rapper duo Bob Vylan shouted “You want your country back? You’re not getting it back!” to an overwhelmingly white, middle-class audience roaring its approval. The message was unmistakable: Britain has been colonized – and its dominant culture not only accepts, but celebrates, it. Britain’s transformation has been driven not by invasion, but by invitation. The country’s population, political culture and national cohesion has been radically reshaped by immigration – one wave in the 1950s, driven by post-World War Two...