I've been down that London today, for a meeting. Here's my review of London, in the form of a sort-of poem-type thing.
Loads of fantastic galleries
The fact that you don't need a car
And lots and lots of sushi bars
(although, only for the veggie stuff - remember kids, fish are friends, not food!)
The grime and the crime
The tube and the suits
The black snot
There you go, no need for you to visit now.