Question: In what 1942 British romance film did actress/singer Jane Birkin's mother star in?

Context articles: Origin Vol. 1
Birkin bag
Lucy Gordon (actress)
Lou Doillon
Jane B. par Agnès V.
Judy Campbell
Boxes (film)
Andrew Birkin
Slogan (film)
Breach of Promise (film)

Origin Vol.
 1 (also referred to as Origin I) is an album by the Swedish band The Soundtrack of Our Lives.
 It was released in Europe during October 2004, and in the US during March 2005.
 Actor and singer Jane Birkin appears on the track "Midnight Children".
 The song "Bigtime" was used as the official theme song for WrestleMania 21 and was later used in "Gran Turismo 4" as part of the soundtrack.
 "Bigtime" was also used by Sky1 in an advert for a new episode of "Futurama".
 The song "Mother One Track Mind" was also used in Gran Turismo 4 as part of the soundtrack.
The Birkin bag is a personal accessory of luggage or a tote by Hermès that is handmade in leather and named after actress and singer Jane Birkin.
 The bag is currently in fashion as a symbol of wealth due to its high price and use by celebrities.
 Birkins are the most popular bag with handbag collectors, and Victoria Beckham owns over 100 of them.
Lucy Gordon (22 May 1980 – 20 May 2009) was an English actress and model.
 She became a face of CoverGirl in 1997 before starting an acting career.
 Her first film was "Perfume" in 2001 before going on to have small roles in "Spider-Man 3", "Serendipity" and "The Four Feathers".
 Gordon had played the actress and singer Jane Birkin in the film "", a biopic of singer-songwriter Serge Gainsbourg.
 Before the film was released, she was found hanged in her flat in Paris on 20 May 2009 after committing suicide.
Lou Doillon (born 4 September 1982) is a French model, singer, and actress.
 Her father is director Jacques Doillon and her mother is British actress and singer Jane Birkin.
Jane B. par Agnès V. is a 1988 French docudrama film directed by Agnès Varda and starring French-English actress Jane Birkin.
 The film was conceived when Birkin admitted to Varda she was apprehensive about turning 40 and Varda told her it was a beautiful age and the perfect time to make a portrait on Birkin's life.
Judy Campbell (born Judith Mary Gamble; 31 May 1916 – 6 June 2004) was an English actress and playwright, widely known to be Noël Coward's muse.
 Her daughter is the actress and singer Jane Birkin, her son the screenwriter and director Andrew Birkin, and among her grandchildren are the actresses Charlotte Gainsbourg and Lou Doillon, the late poet Anno Birkin, the artist David Birkin and the late photographer Kate Barry.
Boxes (French: Les Boites ) is a 2007 French film and the directorial debut of Jane Birkin.
 Birkin also stars alongside Geraldine Chaplin and Michel Piccoli.
 The film is based on Birkin's own family life, chronicling three marriages and the three children she bore from these marriages.
 The title alludes to the way in which she compartmentalises these relationships and stages of her life.
 The film was nominated for the Grand Prix at the Bratislava International Film Festival.
 The film was screened in Un Certain Regard at the 2007 Cannes Film Festival on 21 May.
 It was released in France on 6 June 2007.
Andrew Timothy Birkin (born 9 December 1945) is an English screenwriter, director and occasional actor.
 He was born the only son of Lieutenant-Commander David Birkin and his wife, actress Judy Campbell.
 One of his sisters is the actress and singer Jane Birkin.
Slogan (French Title: L'amour et l'amour) is a 1969 French satirical romantic drama film written and directed by Pierre Grimblat.
 It stars Serge Gainsbourg and Jane Birkin in their first film together.
 The film marked the beginning of the 13-year relationship between Gainsbourg and Birkin.
Breach of Promise is a 1942 British romance film directed by Harold Huth and starring Clive Brook, Judy Campbell, C.V. France, Marguerite Allan and Percy Walsh.
 A playwright meets a young woman and she soon files a fake breach of promise action against him, hoping to receive a blackmail payment.
 Instead he decides to marry her to teach her a lesson.