Who Goes There! (1952)
Who Goes There! is a 1952 British comedy film directed by Anthony Kimmins and starring Nigel Patrick, Valerie Hobson and George Cole. The film depicts the farcical activities of the various inhabitants of a Grace and Favour house near St. James Palace in Central London. It is based on a 1951 play by John Dighton, who also wrote the screenplay.
More at Wikipedia.