I,ll post whilst munching a burger and drinking coffee. (I'm English.)
I am retired, but during the whole of my working life, I worked for a company who contracted to foreign governments. This involved two or three year stay, normally, in different countries.
As we all know, English comes in many varieties. <<the interesting thing, I found, was that English, (from England- that is not intended to be rude) was the easiest to understand, however remote from the original was the pronunciation. Oddly, I now, because of family circumstances, now live in Denmark. Danish is not exactly a worldwide language, as you would understand. It is, however, a very precise and old language. Of all the countries I have visited, I find it very difficult to make myself understood, if I stray even a little from the original.
Anyway, I think I am off thread. Like the OP, I also notice the difference in the two languages. But I do believe that, whilst very American expressions are creeping in to UK English - and all pop singers seem to think it is a requirement to sing with an American accent, at the same time, American is evolving.
My main contact with the American language is through TV. Probably a poor source. But I have noticed that invariably, for example, the flat "a" as in BAT has become "e" as in BET.
