Painter and colour printer, born in London, son of an architect, Edward F Knight. Arnold studied at Poole and with the Parkstone-based artist Walter Stritch Hutton, was a member of Bournemouth Arts Club and a keen sailor and oarsman, belonging to Parkstone Sailing Club. Despite being disabled by polio, Knight was an ardent landscape painter. As well as views of Dorset, he produced much work after World War II in Gloucestershire, where he stayed with his artist friends Arthur and Bertha Bell in Cheltenham. He also produced drawings for an experimental fighter for Gloster Aircraft Company. Showed at RA, RBA and Walker Art Gallery, Liverpool.