My husband did a Harry Potter inspired tour for me when we were there last summer. He took me to the locations they filmed Diagon Alley and the exterior of the Ministry of Magic. But my favorite was this place: http://store.minalima.com/house-of-minalima/ It had examples of all the artwork that went into the books and films. The downstairs is the shop, but upstairs are the galleries. The museum took about an hour. Have a great time on your trip!

We did mail the letter. Both times we mailed in a letter, we received an answer. My kids were thrilled!

Both those things make my "never do" list.