Submitted by Philip Storry on
When my friend Alasdair spent some time on Trafalgar Square's Fourth Plinth, I took up and took some photos. These fine people were around, and I'm still not sure why they had gas masks.
They did give a very good answer when I asked them. "Why not?"
But that doesn't necessarily answer the question, as much as make me look for an answer. One which has eluded me so far...