Upstairs, Downstairs - Season 1 - Eps 12: The Key of the Door
Winter 1908: Elizabeth befriends a bunch of Bohemian-types, but is drawn to two in particular: Evelyn Larkin, a radical Socialist extremist, and her lover, Lawrence Kirbridge, a handsome, free-spirited poet. On the eve of her 21st birthday, with her parents out of town, Lizzy invites the entire group to Eaton Place, and is humiliated when the Bellamys return home unexpectedly and throw everyone out. Anxious to prove she's nothing like her parents, Lizzy is compelled to do something extreme, leading to a falling out with her parents and a harsh discovery about Evelyn.
About Upstairs, Downstairs

Title: Upstairs, Downstairs
First Air Date: 1971-10-10
Last Air Date: 1975-12-21
Status: Ended
Rating: 7.615/10 (from 26 votes)
Language: EN
Seasons: 6
Total Episodes: 68
Network: ITV1
Genres: Drama
Production Companies: LWT
Synopsis
Upstairs: the wealthy, aristocratic Bellamys. Downstairs: their loyal and lively servants. For nearly 30 years, they share a fashionable townhouse at 165 Eaton Place in London’s posh Belgravia neighborhood, surviving social change, political upheaval, scandals, and the horrors of the First World War.
Cast

Christopher Beeny
Edward Barnes

Gordon Jackson
Angus Hudson

Jacqueline Tong
Daisy Barnes

Jenny Tomasin
Ruby Finch

Angela Baddeley
Mrs. Bridges

David Langton
Richard Bellamy