It's because I'm making arrangements for Sio to stay with various friends and family members when she goes to London in a couple of weeks. She'll be there for 6 days, she's planning on touring UCL with my friend who works there on the 28th or 29th, and then she's on her own as far as plans. She's done a bunch of touristy things there before - museums, the Eye, etc., but I'm sure she's keen for suggestions, so if you have any, please leave them in the comments.
BTW, just to show you how lucky this kid is, she's going to Greece before she goes to London. Yeah, we could have used the money spent on this trip (less than $1K) to fix up stuff around the house, or as a downpayment on a new car, but I'm a more grasshopper than ant.