Guest Blog: Kieran Knowles On CHICKEN SOUP. At Sheffield CrucibleFebruary 13, 2018The first thing I should say is: this story isn't mine. I found it in a pub in October 2016 in the shape of a 68-year-old actor and playwright called Ray Castleton. He had been to an artist's development performance of Operation Crucible in the Crucible's Studio Theatre in Sheffield, and he was telling me about himself and a play he had written for a project called Experience Barnsley.