I've been running street photography courses for the past couple of years around Shoreditch run through the Indytute. 

"The wilds of Shoreditch are home to a number of interesting specimens. The area is mainly populated by the distinctive Hipster, but you may catch a glimpse of a sharp-suited banker or a shot of a fast-moving bike courier as he weaves in and out of the traffic; a rare capture, the gazelle of the Urban Jungle. Join award-winning documentary photographer James Millar for an educational and humorous journey around the capital. Improve your photography skills and see the city afresh. Learn how to bother interesting-looking people in the street for a picture without getting punched, pick up some photographic 'art-speak' to impress your friends with, and acquire a few picture-taking gimmicks to make people think you know what you're doing." 

More info here