Many of the best made and wittiest advertising films and videotapes are being made in Britain, where the kind of elaborate ads we are beginning to see now on American television are already a tradition. Tonight's program comprises the advertisements deemed the finest in 1985 by the British Advertising Broadcast Awards Limited (BABA), an organization of industry professionals that has awarded advertising films in various categories since 1976. The Museum of Modern Art Department of Film acknowledges the help of Tony Solomon and Peter Bigg, BABA's chairman and administrator, respectively, and Barry Day of McCann-Erickson Worldwide in New York.