The Weaker Sex
(1948, Cecil Parker, Ursula Jeans)
Two buses appear. One is apparently in wartime Southdown livery, but as it takes on passengers it's revealed as London Transport ST821 (GK3192), which was a green ST new in 1931 to National Omnibus; it's now preserved:
Also seen is a genuine Southdown 'decker, registration UF5755 - can anyone identify?
(thanks Colin Read)