This YouTube video will give you a good idea of a British stereotype as perceived by people in the United States:
Warning: I'm old enough that I might know <em>out-of-date</em> stereotypes. There may be newer stereotypes!
In the United States, we have a set of stereotypes of British people that are probably based on comic stage and movie depictions, P. G. Wodehouse's books about dumb aristocrat Bertie Wooster and his brilliant butler Jeeves, the recent TV series "Downton Abbey," and Arthur Conan Doyle's stories about Victorian detective Sherlock Holmes. That is, our stereotypes are distorted versions of upper-class British in the Victorian and Edwardian eras, before World War I.
My apologies in advance to Brits.
1) The British say "Ta-ta!" and "Pip-pip!" and "Cheerio!" and "Old boy!" and "Eh what?"
2) British kings are all like mad King George III and Henry VIII. But British queens are OK.
3) The British are pompous, formal, and "stuck-up."
4) The British all love cricket.
5) The British all go to schools like Hogwarts (in the Harry Potter books).
6) London is always covered by a "pea-soup fog."
7) The British eat almost nothing but mutton. Except the kids, who eat treacle, but we don't know what treacle is.
8) We don't think of Scotland as being part of England. That's a different stereotype. Scottish men all wear kilts all the time, they all play bagpipes, they all eat haggis, and they are all stingy (or, politely, "thrifty"). (The "thrifty Scot" is such a stereotype that our favorite brand of sticky tape is "Scotch tape," and the branding features a tartan pattern.