Horrocks first came to prominence for her title role in the play The Rise and Fall of Little Voice (1993), which showcased her talent for impressions and impersonations. She reprised the role in the film Little Voice (1998).
She is known for appearing in several other popular films, including The Witches (1990), Life Is Sweet (1990), and Sunshine on Leith (2013). Her television credits include Absolutely Fabulous, Victoria Wood - We'd Quite Like To Apologise, Bad Girl, Heartland, Wyrd Sisters, Foxbusters, Jericho, Red Dwarf, Trollied and Inside No.9.
Her distinctive Lancashire accent has made her a popular choice for several characters in animated films and TV shows, including Chicken Run (2000), Spot the Dog (2000), Corpse Bride (2005) and Fifi and the Flowertots (2006).
Most recently, her roles include voicing the Tubby Phone in Teletubbies and Queen Elenor in Long Live the Royals.
As Fenchurch (Fenny)
As the Tanngrisnir computer imitating Fenchurch from Arthur's memories