Date Photo Taken: 30 October 2010.
Location: Under Westway, off Portobello Road, London W10. Close to 279 Portobello Road, W10. Look right down Acklam Gardens and you'll see a boarded off area; maybe used as a club/cafe. I took this photo through the chained shut gate, hence I couldn't get round the gazebo but it is unmistakably Stik, as is this Stik mosaic version in the same area.
You can also book a London Street Art Walking Tour through Viator.