There is song about an Englishman in New York feeling alien at one of the most beautiful cities on earth. However, it must be noted that there are also sons and daughters of Uncle Sam who feels alien in London.
People from UK come to US in the same way that people from US come to UK. This is when adjustment to words, culture, weather and the like is a must. While the differences may not be that big as that of US and say, a developing country or UK and a developing country, it must be noted that there are major differences that ought to be considered.
Other than bringing photos and stuff that will make you feel at home, it is also ipmotnat to think of thelcothing. Considering how rain is so frequent in Londo, itis am su to wear appproate coats and shoes tokeep you protected.