I usually don't like hearing Brits use American slang like "Cool" or "Take a chill pill, man," mostly 'cause they sound stupid when they attempt to emulate us.
So I was interested in the editor of a London paper, the Times, getting into trouble because she wrote "You do the math." (British people say 'maths', not 'math' but it wouldn't have been the right expression if she wrote 'do the maths.' Cliches have to stay intact!)
"A little voice in my head said: 'No! Don't do it! Put the 's' on math or you'll set them all off again about Americanisms!'
...sure enough, in poured the howls of outrage.
Times readers want to keep that paper pure, and not have it filled with Americanisms. It's too late for the Times anyway as it's a Murdoch paper now so standards have slipped.