About Sarah Alexander
Sarah Smith, known professionally as Sarah Alexander, is an English actress. She has appeared in British series including Armstrong and Miller, Smack the Pony, Coupling, The Worst Week of My Life, Green Wing, Marley's Ghosts and Jonathan Creek. Since 2013, she has starred in the BBC One series Jonathan Creek as Polly Creek, wife of main character Jonathan, making her first appearance in the episode titled "The Clue of the Savant's Thumb" in 2013. She appeared in both series of Look Around You, which Serafinowicz co-created and starred in, as well as O!News, his parody of E!
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.