 In 1983 , Lotterby returned to the show at the insistence of Brian Wilde , who preferred Lotterby 's use of tight shots focused on the trio as they talked rather than Bell 's wide @-@ angle scenes . Lotterby produced and directed one additional series before departing again the same year . Bell then returned to the show beginning with the 1983 Christmas special and produced and directed all episodes of the show to the end of the 31st series . 
