Last year, former Tory minister George Walden wrote a book about the future of life in Britain and why record numbers were emigrating. Taking the form of a letter from a father to his son, it provoked a massive, positive response from readers when it was serialised in the Daily Mail. In the book, Guy and Catherine despaired at having to bring up their two children in an area that had been dramatically changed by mass immigration, where their children had become a minority in school and teachers struggled to deal with so many pupils who did not speak English....