The Girl Who Forgot is a 1940 British comedy film directed by Adrian Brunel and starring Elizabeth Allan, Ralph Michael and Enid Stamp-Taylor.
It was made at the Nettlefold Studios in Walton-on-Thames, based on a play The Young Lady in Pink by Gertrude E. Jennings.
On the train back from her school to Paddington, an eighteen-year-old girl named Leonora loses her memory.
This coincides with her father's decision, having just got his pilot's license to take her mother on a flight to Baghdad.
However his fiancée is extremely jealous, and arranges for a poor confidence trickster to pretend to be her mother in exchange for cash.