The past couple of weeks have been full of gallery visits – Don McCullin, Vincent Van Gogh and Diane Arbus. Dave Heath was at the Photographer’s Gallery – as were the Deutsche Börse Prize shortlist – Susan Meiselas, Arwed Messmer, Laia Abril and Mark Ruwedel. And I finishing off the week with our very own Ant Prothero. I have already written about …