You can get all the authentic British grub you want, which in my case would be very, very little, in and around the Tampa Bay area. Many Brits have settled in that general area, and for some reason quite a few of them seem to have felt it necessary to open British type pubs and restaurants.
So yes, you can get authentic British food over here. Which of course begs the question, why would you want to?
How about a dish of some nice bubble and squeak sir? No thanks, I'll just stop by the 7-11 on the way home and pick up a hot dog which has been rolling on those hot, shiny metal tubes since the store opened in 1991.
But what's the difference between British and "traditional" American fares? America shares a majority of the culinary heritage with Britain, esp in the New England region. When a Briton criticizes American fares, he doesn't realize he is criticizing his own country's traditional cooking as well.
Ping to Wallace T. for cuisine, culture, and heritage.