Advice for crossing the US Border. 1) You are there on a holiday. Telling them you are self employed and going to work in an office you are renting there is only asking for trouble. It confuses the hell out of them. You think where you do the work from doesn't matter, they think you need a visa. You lose. 2) If you are going for a conference, print the badge off before your flight and have it with you. 3) Email or up…
This is good advice, but of course it's pretty absurd that anyone has to take these steps to avoid the overly invasive US government.
(As an American, I hate crossing the UK border just as much as crossing the US border. What's the point of being in the EU if you aren't going to act like it? :)