I just failed the Britishness test, based on the questions that are used to decide whether immigrants know enough about Britain to be allowed to become formally British. I scored 70.83% (the required pass score is 75%, seven out of 24 questions wrong.
Try it for yourself: http://www.howbritishareyou.com/quiz.html
ps my wife failed a separate test based on a different line of questioning; maybe we'll get chucked out after a lifetime living in the UK...