THE name of Maurice Elvey has been connected with British films from the very earliest years. He will speak tonight as a man thoroughly acquainted with every ' trick of the trade.' In his work as a producer he has consistently kept abreast of the times and adapted his methods to changing fashions in technique. Several of the most considerable British films ' camo from his megaphone,' if we may so phrase it. He made Roses of Picardy, a foolishly titled but sensitively handled version of that great war book ' The Spanish Farm,' Hindle Wakes , in which the dominance of mill machinery over the lives of the cotton hands was suggested with all the ' expressionistic ' skill of a Fritz Lang , The Luck of the Navy and Palais de Danse, shortly to be released. Mr...Elvey is now producer to the Gaumont Company.