Our guide (Doug) was incredibly passionate yet informative - all the guides have a personal connection to the street art they are showing - whether they are street artists themselves or have a strong interest in capturing it - Doug runs Fifth Wall, an independent short film company focusing on London's creative scenes.
I don't want to give too much away - I strongly recommend signing up and going on one! You can book on the site here: http://alternativeldn.com/walking_tours.php
I enjoyed the tour so much I returned a few weeks later to explore and re-capture some of inspiring street art in the area.
Technical details: Fuji X-M1 with Fujinon 35mm and 16-50mm lenses.