In 2009, Dillon starred in When the Rain Stops Falling at the Almeida, and in 2010 in Design for Living and its successor production A Flea In Her Ear at the Old Vic.
In early 2012, Dillon played the role of Katharina in the Royal Shakespeare Company (RSC) Stratford and touring production of The Taming of the Shrew.
[10] In 2013, she starred with Joel Samuels and William Troughton in Happy New (written by Brendan Cowell) and performed in London's West End.
[12] Dillon is now best known for her role as Mary Smith in the British television series Cranford[13] on BBC One where she starred alongside Michael Gambon, Imelda Staunton, Jim Carter and Judi Dench.
[18] She has undertaken the following roles in productions by Jarvis and Ayres for BBC Radio 4 of: Honey Ryder in "Dr. No" on 24/5/2008; Tilly Masterson in "Goldfinger" on 3/4/2010; Tracy Draco in "On Her Majesty's Secret Service" on 3/5/2014; Tiffany Case in "Diamonds are Forever"" on 25/7/15 and Patricia Fearing in "Thunderball" on 10/12/2016.