Sadiq Khan: new immigrants know more about British heritage than natives This is followed by a group ceremony at a local town hall, which includes an oath of allegiance to the Queen and the playing of the National Anthem. There have been claims that the test requires a far greater knowledge of history than most British-born citizens would be able to reach, after it was altered last year to contain a greater emphasis on key events and people in British history. Last month, David Cameron fluffed two questions on a mock citizenship test put to him by American television host David Letterman, proving unable to name the composer of Rule Britannia or translate the term Magna Carta. Mark Pritchard, Conservative MP for The Wrekin, said that the citizenship test "unites the country and breaks down barriers." He added: "If Labour want to scrap the citizenship test they should declare it openly." Also in the House interview, Mr Khan disclosed that he had been the victim of racial stereotyping after being mistaken for a defendant when he was attending court in his former role as a leading human rights lawyer. He went on: "But I don't play the victim card. I'm uncomfortable about discouraging youngsters from coming forward to be lawyers, judges and journalists and politicians. What I tend to do is try to explain to young people 'work hard, apply yourself and you can achieve this.' There weren't role models when I was younger. They are out there now.