I don't know much about graffiti or street art, but I recently saw a video blog about a piece of street art which had been done by famous English graffiti artist Banksy being taken off the wall and a bit later appearing in an auction house.
Now, on my way to work today, I rode past this spraying on the wall and I was wondering if this is also a Banksy. It's just by the Camden Canal, across the "Pirate Castle" on Oval Street.
The style is certainly similar, but potentially this is just someone copying the style of big guys out there. If so, well done. I like it :-)