John Piper - Transport Ships Coaling in Cardiff Docks - c.1944. John Piper an artist and theatrical designer also had a talent working in stained glass for projects including Coventry Cathedral. From 1944 the Ministry of War Transport commissioned him to record activity at the Bristol Channel ports, hence, this painting from the roof of a cold store. The original work has copyright assigned to the National Maritime Museum at Greenwich, situated on the banks of the river Thames in London. [123]