One of the suggestions that I got by the local streettogs in London while creating the London Street photography Guide to London map was to check out the South bank in the evening. With the London Eye, Tate modern etc it was sure to be pretty crowded with tourists, but it turned out to be quite a nice blend of natives and others.
The tricky part when visiting places like this is – as a street photographer – usually is to find some actual street life and not just a bunch of street performers and audiences. Well – kind of blew that one, but do I think street performers are a part of the scene. And easy targets as well! :)