Banksy again

Another new Banksy, or at least one I've not noticed in this position before, near the Mount Pleasant Royal Mail offices. The placard says "always faile". Apologies for the angle but it was taken from a moving cab. Of course in London traffic a "moving cab" still gave me plenty of time to notice the stencil, dig my camera out, fiddle with the settings, focus and take several shots, fiddle some more etc.