I love this comedy and have watched it umpteen times. I haven't seen it for a while so the details of the plot escape me, but they don't really matter. What is so good about it is the unselfconscious depiction of London picking itself up after World War II, and the relaxed comedy style of the actors, most of whom will be familiar faces to anyone who watched British TV in the '70s too. Joan Greenwood is a dream as usual - watch out for the vault over the sofa - as a young housewife feeling ever so slightly bored with staying at home and the continuing hardships of the period - and where else could you see Athene Seyler, Fabia Drake and Irene Handl all together? Last and far from least there is a charming appearance from Audrey Hepburn in her fifth film. The men are good but this is really a treasury of female performances. It's all very light and stylish without being over-glamorous, very refreshing.
Also, for serious buffs, the cinematographer was the great Erwin Hillier who worked with F.W. Murnau on 'Tabu', with Fritz Lang on 'M', and with Powell and Pressburger on 'A Canterbury Tale' and 'I Know Where I'm Going', and many other major movies.