You can always spot an American in London. They are the ones always rushing around, being rude, carrying on a fast paced and hectic lifestyle. Watch at the museums, they rush in, do the tour with eyes darting left and right, feet continusously moving and then out the door to the next thing on their agenda.
Brits are more laid back, they value their leisure time highly, and despite what you may think with James Bond ordering martinis all the time, beer is the best seller there.
I love England. Nothing like picking up an English and taking him home to bed. The accent is fascinating.