Beautiful exterior spots, but really the food was much better than I'd have expected. And the many free museums!
Excellent food stalls, especially the one right at the front of the market near Stoney Street which served excellent duck confit sandwiches. Also, the back of the market had excellent foods. We had some amazing macarons, little Chinese lantern fruits (which translate to "princess" in Chinese), and good chocolate.
If you go to London, you must visit at least one of the free museums. They are definitely world class. The British Museum also has an amazing ceiling, which shows some serious structural engineering beauty. The Tate Modern had some really beautiful political pieces that I thought were very well rounded. Very much worth visiting!
And... for the nerds..
Obviously, Platform 9 3/4.