We contemplate that Britain has a culture that it wishes to preserve, and this has something to do with why the Brexit vote went as it did. Americans generally applaud British culture, or at least, applaud that they want to keep their culture. Despite rhetoric to the contrary, all the British seem to like having some immigrants around. What has happened recently is that there has been a sharp uptick in the number of immigrants, enough that a majority of people have said "too many." Yet I don't hear anyone but the very few saying "no immigrants."
What is this culture they hope to preserve? Paul McCartney made affectionate fun of it in "Penny Lane," but what might we list that is something of a continuity in British culture that does not sound ridiculously trivial or is not immediately recognisable as something that happens in other countries as well?
George Orwell wrote "England, Your England" in the early 1940's. It is a good example of the importance of reading primary sources. I am familiar what other English writers of the 20th C have said, Chesterton especially, yet this carries surprises. One can immediately tell that American culture is historically related to it, but we have built something quite different with the same legos.
Just for humor, I resurrect this Field Guide to the 15 Real Nations of Britain that I passed along a decade ago. Plus, now that I've mentioned it, I have to play the song.