Sarah was born in Lambeth, South London. She is best known for Call the Midwife (2016), Doctor Who (2011), Lewis (2007). Quintrell started her career playing Sinéad in the BBC TV sitcom Carrie and Barry and went on to appear in Call the Midwife, Doctor Who, Lewis, The Watcher, The Last Trace, The Marchioness Disaster, Doctors and Island at War. Quintrell often works on stage and was the original Bobbie in Mike Kenny's The Railway Children at York Theatre Royal (2008-2009). She transferred with the production to London Waterloo Station, where it won the Olivier Award for Best Entertainment (2011). She has also played Eliza Doolittle in Pygmalion (2005), Celia in As You Like It (2007), Forty Years On (2011) and an assortment of new writing including two national tours. Most recently she played Natalie in James Phillips's City Stories which had a residency at St James Theatre London (2014-2015) and transferred to 59East59 Theater New York as part of Brits Off Broadway (2016). She trained at Manchester Met from 2000-2003 graduating with First Class Honours.