Woodcock began her acting career in 2000, starring in the British crime drama Hero of the Hour as Jessica. After a five-year break, Woodcock's career began to take off. 2005 and 2006 saw her act in both television and stage productions. Notably, she made an appearance on the long-running UK medical drama Casualty. In 2005 she also portrayed a young Estella in the stage production of Charles Dickens's Great Expectations, where she was praised for her "strong performance" by The British Theatre Guide. In 2007 she starred as Alice alongside veteran British actors Holly Aird and Bradley Walsh in the TV miniseries Torn, a role for which she received critical acclaim. In 2008 she acted in the television adaptation of Tess of the D'Urbervilles as Liza-Lu Durbeyfield. In March 2009 she appeared in the new BBC series All The Small Things as Georgia Caddick, alongside Sarah Alexander, Sarah Lancashire and Richard Fleeshman. In autumn 2009 she played the character of Celia Radley in Dorian Gray, the film adaptation of Oscar Wilde's novel The Picture of Dorian Gray. In 2009 she also had a small part in the Greenlit Productions TV mini-series Collision. She played the role of Bea Holloway in the BBC One drama series Land Girls.