Sharman Douglas , daughter of Mr Lewis Douglas , US Ambassador in London , paid a visit to Denham Studios , where the film , The Chiltern Hundreds is being shot under the direction of John Paddy Carstairs . Lana Morris , star of the film , who plays the part of a waitress , really becomes a waitress when she serves Miss Douglas with tea during her visit to Denham , Buckinghamshire , England . 16 March 1949