re: European Vacation Photos
If you have the time I would suggest a tour around London by bus when you get there. These tours last for two to four hours, This is a good way to see the main sites and you can always go back and visit something on your own.
The Tower of London and Tower Bridge is a good start, Whitehall, the Mall and Buckingham Palace is another little jaunt, they are close together. A trip up river is nice as well.
Whatever you do, you must have a pint of bitter. You can get all the other beers anywhere on earth, maybe start with a half pint, you may not like it.