Time to write

You’re on a blog of English customs and culture website. John, an American student, leaves his message and asks some questions. Give your comments and write a short passage for him. Here’s John’s question:

Hi, I’m from the U.S. and I was wondering what is the difference between Britain, England, and the UK. Second, what do you all call yourselves, British or English (...U.K.ish...?!)? Please, Help! John