One thing I wanted to point out, is remember that in England, they drive on the left hand side of the road, so be extremely careful that you look the CORRECT WAY when you are crossing the street (I always looked BOTH WAYS, all the time, when crossing the street). Many tourists and visitors have needlessly be killed this way, including most recently, a Delta Gamma sister.
http://www.scu.edu/news/releases.cfm/0902/London.html