It is unusual to see incomplete pieces, that are unlikely to be completed at any time in the future, if fact they are such a rare thing that I can only think of three or four examples in the four years I have been doing this. Rarer still is an incomplete Sled One piece, but here is one on the side wall of the garage in Wilder Street.
My understanding is that he got asked to move on, although I am not sure whether that was by the garage owner or somebody else. What it gives you though is a little insight into how a sketched wall turns into something quite remarkable. The zebra on the left is almost complete, but the horse on the right seems to be only half done. What a pity he never got to complete it, because from what we see here, it is a real cracker.