Herman Tulley (Peter Noone) lives with his grandmother Gloria (Marjorie Rhodes) in Manchester. He is the owner of a racing greyhound named Mrs. Brown, with whom he hopes to win the derby in London. He and his friends Barry, Keith, Karl, and Leck play gigs to raise money to enter her. They travel to London, where they start working at the fruit market of G. G. Brown (Stanley Holloway). Herman falls in love with Brown's daughter Judy (Sarah Caldwell), a young model. They also befriend a tramp named Percy (Lance Percival).
Mrs. Brown, You've Got a Lovely Daughter contains examples of:
- Censorship by Spelling: A neighbor tells Herman, "You know what that welfare lady said. Gran ought to go to the old people's H-O-M-E." Gloria, who was listening from the other room, yells "I'm not going to any bleeding old folks' H-O-M-E!"
- Eating Pet Food: While eating dinner in Herman's apartment, Percy takes a bite of a dog biscuit and complains, "I say, these croutons are a bit hard."
- Job Song: Mr. Brown teaches the Hermits a song about selling fruit.Carrots and spuds
Jaffas and bloods
They're lovely, they're ripe and sweet
Yell it out loud
Pull a big crowd
For value they can't be beat.
- Panicky Expectant Father: A variation. Herman anxiously paces back and forth outside the doghouse where Mrs. Brown is giving birth.
- Street Musician: Percy sings and plays the spoons in London. The only response he gets is from a woman who accuses him of blocking her view of Westminster Palace.
- Titled After the Song: After the Hermits' first real-life number one US hit, which Herman sings at the end of the movie.
- Title In: The film opens with an aerial shot of Manchester and the words "MANCHESTER, ENGLAND."
- Too Many Halves: During Herman's failed job interview at Advertising House, the boss says, "Advertising is 50% style, 50% creativity, 50% drive." Herman says, "That's 150%, sir."
- Tropey, Come Home: Herman leaves Mrs. Brown tied to a cart at a train station, which drives off while he's not looking. He and his bandmates frantically search for her, even giving up a steady job at a nightclub so they can continue looking, to no avail. Percy eventually finds her and returns her to Herman, who realizes she's pregnant.