rockgran
I love to hear American English used by American people but I don't like to hear their words and phrases being used here as an affectation. Without the accent it can become unpleasantly mangled.
Also - I don't think Santa Claus is especially American as my Scottish parents always refereed to "Santa Claus" and it felt very strange to say "Father Christmas".
That's exactly it! what sounds perfectly normal terminology for an American, when British people adopt Americanisms such as "Do the Math" it just sounds like an affectation. However, having said that, all the twenty/thirty somethings I know say "can I get?" so that appears to be pretty mainstream now, still sounds inappropriate to my ears, and a tad rude because it's rarely accompanied by "please" 