We've seen this film before, it's called Brexit. It is not quite the Hollywood version because US President Donald Trump hates Hollywood. However, it is bigger, louder, with more explosions and more gold leaf than the damp, tweedy, little-England original screenplay. The moral of the story, however, is the same, be careful what you vote for. The British voted to put up trade barriers against their biggest trading partner. Everyone else said it was a bad idea that would leave the economy, and the government revenues that come from it, smaller than they could be. Now the British economy is…