Okay, I cheated. I did the walk twice and the first time round I failed to spot this. I nearly fell over when I did. I mean, mebbe it was the poor quality of the light the first time round, mebbe I didn’t look hard enough,  or mebbe it’s the nature of the piece, in its asbo-baiting hoodie, skulking threateningly in the shadows…. Of course I’d like to think that between the first time and second, just mebbe Banksy was ‘ere and sprayed this up fresh. Hah.